Top 15 Water Source Heat Pump Manufacturers And Supplier In 2026

In the worldwide, there have many water source heat pump manufacturers, they offer many business opportunity for the company that focused on heat pump technology or business, different manufacturers, they will have different situation, to fully know their products information and company, it will be a big help for you to choose the correct manufacture partners before start cooperation. From this article, let find out the top 15 water to water heat pump manufacturers in the world, they have different characteristics after your see this article, you will find the best suppliers.

Here is the top 15 water source heat pump manufacturers list

The list ranking is not in any particular order, only focused on their location, years, products features, background.

Carrier

Head Office: Palm Beach Gardens, Florida, USA.

Founded: 1915.

WSHP Features: High-efficiency units (such as the AquaSnap and 30XWH series) featuring compact designs, low-noise operation, and compatibility with advanced digital controls for building management.

Background: Founded by Willis Carrier, the inventor of modern air conditioning, the company is a global leader in HVAC and refrigeration. In 2024, it expanded its European heat pump footprint by acquiring Viessmann Climate Solutions.

Trane (Trane Technologies)

Head Office: Swords, Ireland.

Founded: 1913 (incorporated).

WSHP Features: Renowned for industrial-grade reliability and high-lift capabilities. Their water-to-water systems often utilize low-GWP refrigerants and thermal storage integration for large-scale decarbonization projects.

Background: Starting as a family plumbing business in Wisconsin, Trane evolved into a premier climate innovator. It is now a primary brand of Trane Technologies, specializing in sustainable commercial and industrial HVAC solutions.

Daikin

Head Office: Osaka, Japan (European HQ in Ostend, Belgium).

Founded: 1924.

WSHP Features: Features high-performance inverter-driven compressors that allow for precise capacity control, exceptional seasonal efficiency (SCOP), and versatile integration into multi-zone VRV systems.

Background: A global leader in air conditioning, Daikin celebrated its centennial in 2024. It is recognized for its “fusion” of refrigerant and compressor expertise, holding a dominant market share across Europe.

Lennox (Lennox International)

Head Office: Richardson, Texas, USA.

Founded: 1895.

WSHP Features: Known for the L Series and advanced commercial units that emphasize high energy efficiency (EER) and ease of service. Many models feature scroll compressors and integrated smart controls for precise building climate management.

Background: Starting with the invention of the riveted-steel furnace, Lennox evolved into a global HVAC titan. It maintains a strong European presence, providing high-reliability commercial solutions and focusing on sustainable residential electrification.

Bosch (Bosch Home Comfort Group)

Head Office: Wetzlar, Germany (Group HQ in Gerlingen).

Founded: 1886.

WSHP Features: Specialized in the FHP and Compress series, which offer compact footprints, quiet operation, and multi-stage or variable-speed compressors. Their units are highly regarded for groundwater and geothermal applications.

Background: A global technology leader, Bosch entered the heat pump market in the 1970s. In 2025, it completed a major $8 billion acquisition of Johnson Controls’ HVAC business, solidifying its position as a top-tier provider of global heating and cooling solutions.

KLR Heat Pump

Head Office: Guangdong, China

Founded: 2005

WSHP Features: Heat capacity cover 9kW to 300kW, accept customized orders. KLR can custom the water to water heat pump orders according to client special demand. R32 and R40a refrigerant option. Using On/Off and Inverter technology. It’s reliable OEM/ODM heat pump manufacturers partner.

Background: KLR is a OEM expert heat pump manufacturer in China, offer premium OEM service to cooperation partners. With strong technical support and high quality heat pumps to support partners expand more market share. They have international heat pump factory. KLR heat pump company products range covering air source heat pump for heating, cooling and domestic hot water, swimming pool heating, electric hybrid heat pump water heater, commercial food dehydrators, home freeze dryers machine etc. Widely products to support partners different kinds of choice..

Mitsubishi Electric

Head Office: Tokyo, Japan.

Founded: 1921.

WSHP Features: Renowned for the CITY MULTI WR2 series, which uses water-cooled VRF technology to provide simultaneous heating and cooling with heat recovery. These systems offer exceptional seasonal efficiency and flexible modular installation.

Background: A pioneer in inverter technology, Mitsubishi Electric is a dominant force in high-efficiency HVAC. Through its joint venture with Trane (METUS) and its European operations, it leads the market in advanced heat recovery and variable-refrigerant-flow systems.

AAON

Head Office: Tulsa, Oklahoma, USA.

Founded: 1988.

WSHP Features: Offers highly configurable, semi-custom SB and WH Series units known for high-efficiency ratings and durability. Features include double-wall construction, variable speed fans, and advanced factory-integrated controls for commercial use.

Background: Founded by Norman Asbjornson, AAON specializes in high-performance semi-custom equipment. Since 2025, it has expanded its footprint in the European and data center markets, focusing on decarbonization through next-generation “Alpha Class” heat pump technology.

ClimateMaster

Head Office: Oklahoma City, Oklahoma, USA.

Founded: 1955.

WSHP Features: Known for the Tranquility® series. Features include vFlow® internal variable speed pumping technology, integrated digital controls (iGate®), and ultra-quiet operation through advanced sound attenuation.

Background: Originally founded in Florida, it relocated to Oklahoma to centralize its 510,000-square-foot manufacturing base. It is recognized as one of the world’s largest dedicated manufacturers of water-source and geothermal heat pumps

NIBE Group

Head Office: Markaryd, Sweden.(Europe)

Founded: 1952.

WSHP Features: The NIBE S-series water-to-water units feature high-temperature outputs (up to 75°C), advanced inverter technology, and the myUplink smart-home platform for wireless optimization and energy management.

Background: Named after founder Nils Bernerup, NIBE is a global giant in climate solutions. It expanded aggressively through acquisitions (including WaterFurnace and Climate Control Group) to become a dominant leader in European and North American geothermal markets.

Viessmann (Viessmann Climate Solutions)

Head Office: Allendorf, Germany.(Europe)

Founded: 1917.

WSHP Features: The Vitocal series utilizes high-efficiency “water-to-water” heat exchangers and OptiPerform technology for reliable heating and cooling. Many units now use natural refrigerant R290 (propane) for minimal environmental impact.

Background: A century-old family business that transitioned into a leading digital climate solution provider. In 2024, its climate division was acquired by Carrier, creating a global powerhouse in sustainable heating and heat pump technology.

Vaillant Group

Head Office: Remscheid, Germany.(Europe)

Founded: 1874.

WSHP Features: The flexoTHERM and flexoCOMPACT ranges are highly versatile, allowing one unit to use ground, water, or air as a heat source. They emphasize green technology with low noise and high flow temperatures for radiator-based retrofits.

Background: Founded by Johann Vaillant, the company pioneered the gas-fired water heater. Today, it is a primary driver of Europe’s “heat pump first” strategy, focusing on high-efficiency residential systems and natural refrigerants.

Stiebel Eltron

Head Office: Holzminden, Germany.(Europe)

Founded: 1924.

WSHP Features: The WPE-I and WPF series offer high-efficiency water-to-water heating and cooling. They feature advanced inverter technology, compact mono-block designs, and integration with the Internet Service Gateway (ISG) for smart home management.

Background: A global leader in building services, the company pioneered heat pump development in the 1970s. It remains family-owned and is a primary driver of Germany’s transition to sustainable, electricity-based heating.

Thermia

Head Office: Arvika, Sweden.(Europe)

Founded: 1923.

WSHP Features: Renowned for HGW (Hot Gas Water) technology, which produces domestic hot water while heating the building. Their Atlas and Calibra series provide market-leading seasonal efficiency (SCOP) and ultra-quiet operation.

Background: A Swedish pioneer that developed the world’s first heat pump with a built-in water heater. Now part of the Stiebel Eltron Group, Thermia remains a premium brand focused on high-end Nordic geothermal solutions.

Alpha Innotec

Head Office: Kasendorf, Germany.

Founded: 1998.

WSHP Features: The alterra series is highly modular, offering over 100 combination possibilities for water-source applications. Units feature high flow temperatures, natural refrigerants (R290), and the alpha home intelligent control system.

Background: A brand of ait-deutschland GmbH (part of the NIBE Group), Alpha Innotec is one of Europe’s most innovative heat pump specialists. It maintains one of the continent’s most advanced research and acoustic testing centers for thermal technology.

Conclusion:

If you want to find the best water source heat pump with good reputation, above manufacturers and brands are very good choice, they have long history, good reputation and reliable products. On the other hand, if these good brand may need a MOQ(minimum purchase volume), you need to contact with their local sale agents.

KLR heat pump is a professional OEM heat pump manufacturer, offer small MOQ and offer customized service to cooperation partners. If you want to buy small volume heat pump for projects or build your own brand. KLR will be your good choice.