Air to water heat pump - Air to Water Heat Pump (Residential use) HYDROLUTION is a complete modern system for heating, cooling and producing sanitary hot water. It absorbs ‘free’ heat from outdoor air and amplifies to generate ideal temperatures and hot water swiftly and efficiently.

 
A2W is a heating system that captures heat from the air to create hot water for use in buildings. It minimizes environmental impact with less CO 2 emissions compared to fossil fuel-using heaters, driving demand in Europe. …. Flynyon helicopter tours

5 days ago ... While it is true that air to water heat pumps are pricier than their air to air counterparts, they are known for exceptional efficiency (up to ...Are you wondering, if an air-to-water heat pump is worth it for you? In this video, I try to provide all you need to know about this low-carbon heating alter... Air/water heat pumps draw energy from the ambient air. They suck in the outside air and make the warmth stored through compression available for heating purposes. After use, the cooled air is discharged back into the external environment. Air/water heat pumps work efficiently with external air at a temperature as low as -20 °C. Are you wondering, if an air-to-water heat pump is worth it for you? In this video, I try to provide all you need to know about this low-carbon heating alter...This is how a heat pump works. STEP 1. Liquid refrigerant is pumped through an expansion device at the indoor coil, which is functioning as the evaporator. Air from inside the house is blown across the coils, where heat energy is absorbed by the refrigerant. The resulting cool air is blown throughout the home’s ducts.Heat pumps are a proven technology that has been used for decades, both in Canada and globally, to efficiently provide heating, cooling, and hot water to buildings. The Hydron-Aire EVI Air to Water Heat Pump is Manitoba’s most efficient air source solution on the market today. It has approximately 3 to 4 times greater thermal efficiency than ...Apr 20, 2023 · A heat pump water heater uses ambient warmth in the air to heat up a refrigerant and in turn heat up the water. This process, though complex, is a much more efficient way of heating up water. Best Ofs Warm your home with the free outdoor air. With a NIBE air/water heat pump, you keep your home warm during the cold months of the year and cool during the summer. By converting the energy from the outdoor air, you lower your energy costs in an environmentally friendly way, while creating a pleasant indoor climate.Available as both on-demand and tank-type domestic water heaters (the latter, shown at left), these house an air-to-water heat pump that draws heat out of the ambient air—typically warmed by a nearby furnace or other mechanicals in the …Trane has released the Ascend® Air-to-Water Heat Pump Model ACX, the first air-to-water pump solution in its portfolio that provides both electric heating and cooling, giving building owners an avenue to pursue decarbonization via electrification. Trane also announced it is bringing a new generation of Precedent® rooftop units to …At outdoor temperatures above 65ºF, the net heating load is zero due to internal heat gains. A low-ambient air-to-water heat pump having the performance shown in Figure 2-15 is being considered for use in this house. Determine the balance point for this house and heat pump. Also determine what percentage of the seasonal heating energy can be ...Effective January 1, 2023, the federal government issued new standards for heat pump products which caused manufacturers to replace HSPF and SEER efficiency ratings with HSPF2 and SEER2. At that time, the Sponsors of Mass Save will update efficiency requirements for residentially-sized air source heat pump equipment (rated below … Enjoy maximum comfort with this high-efficiency, two stage water-to-air heat pump from Bosch. Up to 30 EER (part load) and up to 21 EER (full load) GLHP. Up to 4.7 COP (part load) and up to 4.4 COP (full load) GLHP. Optional Heat Recovery Package (Desuperheater) 10-year limited parts and labor allowance warranty. More details. Thermia iTec ECO is a family of air source heat pumps designed to suit a variety of individual needs, prevent excess energy consumption and achieve maximum benefits: • Versatile energy supply with 5kw, 8kw, 12kw and 16kw available depending on the home needs. • Reduces energy consumption by up to 75%. LG offers several types of air-source heat pump solutions, and we want to help you navigate the process of selecting the right one. Let’s look at what a heat pump is, where heat pumps should be installed, and the advantages provided by different types of air-to-water heat pumps. About 85% of all HDDs are within heat pump range (for the Nordic brand). If your heat loss comes in at 10kw at -40F, you'd use about 27000kwh annually if you're using an electric boiler. Using a heat pump + electric boiler, you'd use about 13000kwh a year assuming the heat pump handles temps -5F and higher.The Daikin air to water heat pump, is a total domestic heating and hot water system. Daikin air to water heat pumps utilize a scroll compressor design with fewer moving parts and greater dependability. Daikin has more than 50 years of experience in the production of air source heat pump systems, manufacturing over a millionThe new 30AWH-P Monobloc Air-to-water heat pumps with R290 natural refrigerant result from a successful combination of innovation and sustainability for a high comfort all year round. Features & Benefits; Controls; Designed for heating and cooling applications, they are suitable for both new housing and renovation, for residential and light ...The air-to-water heat pump that Ross saw being installed in upstate New York was an Advantage Air-to-Water Heat Pump manufactured by Enertech. Expert assistance with this segment was provided by The Radiant Store , Air & Water Source Group, LLC , B&D Manufacturing, Inc. , Taco Comfort Solutions , Axiom Industries Limited , and Caleffi North ...Learn about the benefits, types and features of Daikin Altherma air-to-water heat pumps, a cost-efficient, renewable and all-round heating, cooling and hot water system for any situation. Find a brochure, a heat pump calculator, a reference …Hot water from a tap or shower head has become a main staple of the modern home. The ability to turn on the hot water tap and almost instantly obtain hot water is a feature of most...Heat pumps are a great way to heat and cool your home, but they can be confusing. This guide will provide an overview of heat pumps and how they work, as well as some tips for choo...The new 30AWH-P Monobloc Air-to-water heat pumps with R290 natural refrigerant result from a successful combination of innovation and sustainability for a high comfort all year round. Features & Benefits; Controls; Designed for heating and cooling applications, they are suitable for both new housing and renovation, for residential and light ...The higher the HSPF rating, the more efficient a heat pump is at heating, which results in less energy used and more energy savings overall. ENERGY STAR heat pumps must have at least an 8.5 HSPF, but heat pumps can range up to 14 HSPF. So, going up to 13.5, Mitsubishi HSPFs rank on the high end.At outdoor temperatures above 65ºF, the net heating load is zero due to internal heat gains. A low-ambient air-to-water heat pump having the performance shown in Figure 2-15 is being considered for use in this house. Determine the balance point for this house and heat pump. Also determine what percentage of the seasonal heating energy can be ...The Ambient Heat Pump is an air-to-water heat pump providing the ultimate high efficiency, zero emission solution for any hydronic heating system. Not only is it more efficient than traditional boiler and electric resistance heating technology, but the Ambient Heat Pump also outperforms traditional heat pump technology.The COP of an air to water heat pump tends to range from 3.4 to 5. The higher the COP, the more efficient the heat pump. To take an example, a coefficient of ...This is how a heat pump works. STEP 1. Liquid refrigerant is pumped through an expansion device at the indoor coil, which is functioning as the evaporator. Air from inside the house is blown across the coils, where heat energy is absorbed by the refrigerant. The resulting cool air is blown throughout the home’s ducts.An older, 70% efficient gas boiler could cost about £1,181 per year: (12,000kWh ÷ 70%) x 6.89p per kWh of gas. An LPG-fueled boiler would cost about £1,434 per year: (12,000kWh ÷ 92%) x 11p per kWh of LPG. An air source heat pump would cost about £1,094 per year: (12,000kWh ÷ 300%) x 27.35p per kWh of electricity.Carrier offers a range of air-to-water heat pumps for different applications, such as light commercial, residential, healthcare, education and office buildings. The products use the latest Carrier technologies and meet current …1. The compressor compresses the returning low-pressure refrigerant and turns it into high-temperature and high-pressure gas and discharges it. 2. The high-temperature and high-pressure refrigerant gas flows through the copper pipe wrapped around the outside of the water tank, and the heat is conducted into the water tank through the copper pipe.Trane has released the Ascend® Air-to-Water Heat Pump Model ACX, the first air-to-water pump solution in its portfolio that provides both electric heating and cooling, giving building owners an avenue to pursue decarbonization via electrification. Trane also announced it is bringing a new generation of Precedent® rooftop units to …A split system air-to-water heat pump is an easy tie-in, as shown in Figure 6. Just add a pair of tees, a circulator and — if you like to sleep better at night — a magnetic dirt separator. The latter minimizes the potential for any existing crude in the system to coat the heat pump’s refrigerant-to-water heat exchanger. FIGURE 6Jul 10, 2019 · What is an Air to Water Heat Pump? Air to water heat pumps (AWHPs) are a deep energy retrofit option to electrify a building’s domestic hot water system. Without AWHPs, domestic hot water (DHW) systems are a significant source of carbon emissions and operating expenses, particularly in multifamily buildings, hotels, and dorms. Air-to-water heat pumps transfer heat from the outside air to a water-based system for heating and cooling, while mini-splits directly cool or heat individual rooms without ductwork. Comparing ductless mini-splits and air-to-water heat pumps, it's crucial to consider zone control capabilities versus unit control. Mini-splits offer independent ...Works at outdoor temperatures of -20°C. With its 6kw to 16kw output, the Nibe F2040 series is another great air source heat pump to consider. This Swedish manufacturer is another leading brand in the air source heat pump industry. They’ve gained a sizable following among UK homeowners.Learn how air-to-water heat pumps can provide high efficiency, low-temperature heating and cooling, and superior comfort in cold climate applications. The article …Water-to-air heat pumps transfer the underground heat energy from hot water to the indoor air distributed through a building's ductwork. When a hotter material ...Water-to-water heat pumps transfer the underground heat energy from hot water or steam to indoor hot water or steam. This hot water or steam is then distributed within homes and businesses through radiators, hot water baseboard heaters, or radiant floor heating. When a hotter material comes into contact with a colder one, this temperature ...The air-to-water heat pump that Ross saw being installed in upstate New York was an Advantage Air-to-Water Heat Pump manufactured by Enertech. Expert assistance with this segment was provided by The Radiant Store , Air & Water Source Group, LLC , B&D Manufacturing, Inc. , Taco Comfort Solutions , Axiom Industries Limited , and Caleffi North ... Air to Water Heat Pump (Residential use) HYDROLUTION is a complete modern system for heating, cooling and producing sanitary hot water. It absorbs ‘free’ heat from outdoor air and amplifies to generate ideal temperatures and hot water swiftly and efficiently. Founded in 1999, SPRSUN changed the pattern of the heat pump industry, introducing advanced technology. As a professional manufacturer of air-to-water heat pump systems, we provide turnkey solutions, bringing modern heating and cooling ideas to reality. Excellent design and advanced technology echoing together enable SPRSUN to supply built-to ...The water source heat pump replaces the outdoor fan and coil with a heat exchanger. For this system to work the building provides a loop of water. This water loop includes a cooling tower and a boiler to maintain the …As energy efficiency and sustainability become increasingly important considerations for homeowners, heat pump water heaters have gained popularity as an alternative to traditional...Works at outdoor temperatures of -20°C. With its 6kw to 16kw output, the Nibe F2040 series is another great air source heat pump to consider. This Swedish manufacturer is another leading brand in the air source heat pump industry. They’ve gained a sizable following among UK homeowners.About the grant. Heat pumps are renewable heating systems offering lower energy costs and reduced carbon emissions. Your home must well insulated to benefit ...Knowing how to install and maintain a water well pump can come in handy. However, if you have zero to limited plumbing experience, it’s best to leave the installation of your water...With air-to-water heat pumps, the grant rate is €6,500 for houses, and €4,500 for apartments. All dwellings get a grant of €3,500 for air-to-air heat pumps. Alternatively, you can get a deep retrofit grant which covers multiple home energy upgrades in …The purpose of a car water pump is to push coolant through the car’s engine block, radiator and hoses to get the engine heat away from the system. Most frequently, the water pump d...Split Systems: Split-system heat pumps consist of two main components: an outdoor unit that houses the compressor and condenser coil, and an indoor unit that contains the evaporator coil. This configuration allows for greater flexibility in installation as well as improved energy efficiency. Ductless Systems: Ductless air-to-water heat pump ...3 days ago · What is an air source heat pump? An air source heat pump (sometimes referred to as an air-to-water heat pump) transfers heat from the outside air to water. This in turn heats rooms in your home via radiators or underfloor heating. It can also heat water stored in a hot water cylinder for your hot taps, showers, and baths. Sep 7, 2022 ... Benefits of Air to Water Heat Pumps · Can be utilised all year round · Provide an unlimited source of heat (outside air) · Are typically less&n...Heat Pump Production in Its Czech Factory Osaka, Japan – Panasonic Corporation today announced that it would invest about 20 billion yen (approx. 145 million euros) in its Czech Plant by the Fiscal Year ending in March 2026 to strengthen the production of air-to-water heat pumps (A2W), which have been experiencing growing …Split Systems: Split-system heat pumps consist of two main components: an outdoor unit that houses the compressor and condenser coil, and an indoor unit that contains the evaporator coil. This configuration allows for greater flexibility in installation as well as improved energy efficiency. Ductless Systems: Ductless air-to-water heat pump ...Aug 17, 2020 ... A water source heat pump (WSHP) performs the same operation, it just moves the compressor into the indoor unit and replaces the outdoor coil ...The importance of finding an economical and efficient alternative scheme, therefore, is beyond words. The experimental research and computational fluid dynamics simulation on the performance and air distribution of air-to-air heat pump and air-to-water heat pump under the same operating conditions are done in this paper.Nov 8, 2019 · How it works. An ATW heat pump will provide heated water at up to about 60C or 140F. The system typically consists of the heat pump, a buffer tank, controls and the hydronic system, which is the same as that for a boiler. One advantage of an ATW system is that, unlike an air-to-air heat pump, it is not trying to heat the space. Air source heat pumps absorb heat from the outside air to heat your home and your hot water, even in the cooler months. They look similar to air conditioning units and still need electricity to run, but because their heat output is greater than the electricity input, they are much more energy-efficient than traditional methods of heating your home.Heat pumps are a great way to heat and cool your home, but they can be confusing. This guide will provide an overview of heat pumps and how they work, as well as some tips for choo... An air-source heat pump can provide efficient heating and cooling for your home. When properly installed, an air-source heat pump can deliver up to three times more heat energy to a home than the electrical energy it consumes. This is possible because a heat pump transfers heat rather than converting it from a fuel like combustion heating ... Air source heat pumps that earn the ENERGY STAR are eligible for a federal tax credit up to $2,000. This tax credit is effective for products purchased and installed between January 1, 2023, and December 31, 2032. Air source heat pumps that earn the ENERGY STAR are eligible for a federal tax credit up to $2,000. This tax credit is effective for products purchased and installed between January 1, 2023, and December 31, 2032. Stiebel Eltron WPL Air to Water Heat PumpsComprehensive air-to-water cold climate heat pump solution The WPL 15 A2W Premium and WPL 25 A2W Premium cold climate air-source heat pumps use outdoor air to produce hot water for …The primary energy source for a heat pump is electricity, however it has an excellent COP. The COP (Coefficient of Performance) is the ratio of electrical energy consumed by the heat pump to usable energy produced. Air to … An alternative heat pump technology — the air-to-water heat pump (AWHP), a new variant of an air source heat pump (ASHP) — uses electricity to move heat from outdoor air into indoor water. These systems are compatible with radiant heating, domestic hot water, and forced-air distribution. They offer the potential flexibility and higher ... Tom Gill. Updated on 26 January 2023. Air-to-air heat pumps cost between £1,600 and £3,100. They can easily double as air conditioning units in summer. The Boiler Upgrade Scheme doesn't cover air-to-air heat pumps. By 2035, all new boiler installations will be phased out in the UK. And, despite the high upfront prices of heat pumps, this ...An air-to-water heat pump uses the same concept as an air source heat pump for drawing out heat from outdoor air. The difference is it delivers the heat via water piped through the building (rather than hot air). These modern hydronic systems are available in Vermont and can operate at ambient air temperatures down to -13 degrees.While a refrigerator pulls heat from inside a box and sends it into the surrounding room, a stand-alone air-source heat pump water heater pulls heat from the surrounding air and transfers it -- at a higher temperature -- to heat water in a storage tank. You can purchase a stand-alone heat pump water heating system as an integrated unit with a ...The energy-efficient R1 compressor increases the performance of heating and hot water while reducing costs. Additionally, the Monobloc offers a stable heating thanks to a wide operation range down to -15℃.AIR-TO-WATER HEAT PUMPS (AWHP) What Is an Air-to-Water Heat Pump? A key part of our air-cooled chiller portfolio, these heat pumps achieve reliable year-round cooling and heating by transferring energy between their internal fluid and …About 85% of all HDDs are within heat pump range (for the Nordic brand). If your heat loss comes in at 10kw at -40F, you'd use about 27000kwh annually if you're using an electric boiler. Using a heat pump + electric boiler, you'd use about 13000kwh a year assuming the heat pump handles temps -5F and higher.EWYQ-AC. Air cooled heat pump for outdoor installation equipped with scroll compressor and R-410A refrigerant. Heating capacity: 11.2 - 13.9 kW. Cooling capacity: 9 - 13 kW. Refrigerant: R-410A. Compressor: Scroll inverter. Explore Get Quotation. Both seasonal cooling & heating hwile reducing energy consumptions and carbon footprint.This is how a heat pump works. STEP 1. Liquid refrigerant is pumped through an expansion device at the indoor coil, which is functioning as the evaporator. Air from inside the house is blown across the coils, where heat energy is absorbed by the refrigerant. The resulting cool air is blown throughout the home’s ducts.Carrier air-to-water heat pumps are designed to meet current and future regulations for energy efficiency. Skip to main content. 01372 220 220. Contact us Careers Contact us Carrier.com open_in_new edit_location Select your …Enertech's Advantage (AV) Heat Pump is a turnkey solution for the future of air-to-water heat pump technology.-----Enertech is bringing modern heati...3 days ago · What is an air source heat pump? An air source heat pump (sometimes referred to as an air-to-water heat pump) transfers heat from the outside air to water. This in turn heats rooms in your home via radiators or underfloor heating. It can also heat water stored in a hot water cylinder for your hot taps, showers, and baths. Air to Water Heat Pump (Residential use) HYDROLUTION is a complete modern system for heating, cooling and producing sanitary hot water. It absorbs ‘free’ heat from outdoor air and amplifies to generate ideal temperatures and hot water swiftly and efficiently.Oct 15, 2018 ... ... Air to air heat pumps, air to water heat pumps, ground source heat pumps, water source heat pumps, working principles, system schematics and ...3 days ago · What is an air source heat pump? An air source heat pump (sometimes referred to as an air-to-water heat pump) transfers heat from the outside air to water. This in turn heats rooms in your home via radiators or underfloor heating. It can also heat water stored in a hot water cylinder for your hot taps, showers, and baths. ClimateHub TDM Plus. The TDM Plus system is an "All-in-One" Air-to-Water (A2W) and Air-to-Air (A2A) system. It can be used both for cooling and heating. It enables underfloor heating/cooling and radiator heating, as well as offering Air-to-Air cooling with various options for air conditioning. The TDM Plus can be combined with third party ... With an air-to-water heat pump from CTC, you save up to 75 % on your heating costs. The energy utilised is free and eco-friendly, and contributes to a reduction of CO₂ emissions. CTC has two types of air-to-water heat pump. Variable-speed heat pumps and those with a start-and-stop function. The CTC EcoAir 600 series consists of newly ...The air-to-water heat pump that Ross saw being installed in upstate New York was an Advantage Air-to-Water Heat Pump manufactured by Enertech. Expert assistance with this segment was provided by The Radiant Store , Air & Water Source Group, LLC , B&D Manufacturing, Inc. , Taco Comfort Solutions , Axiom Industries Limited , and Caleffi North ... Air-to-air heat pumps typically cost $3,500 to $7,500 installed (not including adding or altering ductwork), but if you’re replacing your air-conditioning system anyway, opting for a heat pump might add only 3 to 10 percent ($250 to $800) to your total costs. Learn about water-to-water heat pumps in this five-minute video. YORK® product engineers share insight on the basics of using heat pumps for simultaneous heating and cooling applications. The video includes a brief overview of what a heat pump is, how it works and why one would choose to use one over other options. The best air/water heat pump we have ever made. NIBE S2125 is the result of our persistence that always makes our products the best they can be. So that we constantly have to think in new ways, use our knowledge of the harsh climate and test our ideas. Until we have developed the best solutions that keep what we promise. EMW Series. Water-to-water heat pumps can also be referred to as ground source heat pumps or geothermal heat pumps, however you call them – they do the same thing. These type of heat pumps remove heat from the outdoor energy supply source (the ground) via a collector system (a well or ground loop) and move it into your home or commercial ...An air-to-water heat pump uses the same concept as an air source heat pump for drawing out heat from outdoor air. The difference is it delivers the heat via water piped through the building (rather than hot air). These modern hydronic systems are available in Vermont and can operate at ambient air temperatures down to -13 degrees.Works at outdoor temperatures of -20°C. With its 6kw to 16kw output, the Nibe F2040 series is another great air source heat pump to consider. This Swedish manufacturer is another leading brand in the air source heat pump industry. They’ve gained a sizable following among UK homeowners.

Water-to-air heat pumps transfer the underground heat energy from hot water to the indoor air distributed through a building’s ductwork. When a hotter material comes into contact with a colder one, this temperature difference causes heat to naturally move from hot to cold, so heat pumps are renewable and efficient. . Remove private hair male

air to water heat pump

An air to air heat pump is a heating and cooling system that takes heat from the outdoor air and transfers it to the interior of your home. On average, installing an air to air source heat pump costs about £2,400 – £8,800 .A noisy water pump is a very common complaint among RV owners. Some RV manufacturers use the cheapest pumps and installation methods to reduce cost, but this often results in "wate...Stiebel Eltron WPL Air to Water Heat PumpsComprehensive air-to-water cold climate heat pump solution The WPL 15 A2W Premium and WPL 25 A2W Premium cold climate air-source heat pumps use outdoor air to produce hot water for …Ascend® Air-to-Water Heat Pump. Enabled by Symbio® 800 wireless connectivity. Capacity Range: 140 to 230 tons cooling; 1500 to 2500 MBh heating. Refrigerant: R-454B. Heating fluid temperatures up to 140F. Heating operation down to 0F ambient. ASHRAE 90.1-2019 compliant. Request a Quote. Contact a Sales Rep.Air source heat pumps absorb heat from the outside air. This heat can then be used to heat radiators, underfloor heating systems, or warm air convectors and hot ...According to the San Francisco Gate, common causes of air in water lines include valve failures, damaged water tank bladders, accumulated gases in well systems, leaky pipes and dam...EWYQ-AC. Air cooled heat pump for outdoor installation equipped with scroll compressor and R-410A refrigerant. Heating capacity: 11.2 - 13.9 kW. Cooling capacity: 9 - 13 kW. Refrigerant: R-410A. Compressor: Scroll inverter. Explore Get Quotation. Both seasonal cooling & heating hwile reducing energy consumptions and carbon footprint.Nov 8, 2019 · How it works. An ATW heat pump will provide heated water at up to about 60C or 140F. The system typically consists of the heat pump, a buffer tank, controls and the hydronic system, which is the same as that for a boiler. One advantage of an ATW system is that, unlike an air-to-air heat pump, it is not trying to heat the space. Item 1 - 19 of 74 ... Air to water heat pumps · Subcategories · Monoblock heat pumps · Split heat pumps · Combined heat pumps (with hot water heater) &m...Air-to-air heat pumps provide hot or cold air directly to rooms, but do not usually provide hot water. Air-to-water heat pumps use radiators or underfloor heating to heat a whole house and are often also used to provide domestic hot water. An ASHP can typically gain 4 kWh thermal energy from 1 kWh electric energy. They are optimized for flow ...1. The compressor compresses the returning low-pressure refrigerant and turns it into high-temperature and high-pressure gas and discharges it. 2. The high-temperature and high-pressure refrigerant gas flows through the copper pipe wrapped around the outside of the water tank, and the heat is conducted into the water tank through the copper pipe.Jan 11, 2023 · The air-to-water heat pump system is one example of today's miniature versions. It has been stated by many within the industry that these systems are more cost-effective than other cooling or heating options available to building managers and homeowners. The unit consists of two chambers, one that absorbs moisture into its cooling coil and one ... When the water pump goes bad on the Dodge Dakota, you will of course have to replace it. The procedure is the same regardless of the engine that is in the truck, but the water pump...Water-to-water heat pump systems are highly efficient heating and cooling solutions that utilize water as the heat transfer medium. These systems extract heat from a water source, such as a well, lake, or river, and transfer it to a hydronic heating system for indoor space heating or to a water-based cooling system for cooling purposes.0. VIEWS. Air to water heat pump system is a modern room heating device. It collects heat from the air and deploys it to the water pipes for home heating or cooling. Ultra-modern HVAC tools provide the both options of room heating and cooling. In Australia and Northern Europe, you will see the portable to standard custom air to water heat pumps ....

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