deutschland en Products Heat pumps Water-source Weishaupt water-to-water heat pumps (WWP W)

Weishaupt water-to-water heat pumps (WWP W)

Weishaupt water-to-water heat pumps draw their heat from groundwater, which is the most effective heat source for heat pumps. A well system has to be drilled in order to tap into this source of heat.


Installation example Schematic representation of a water-to-water heat pump Cut-away drawing of a water-to-water heat pump

Weishaupt water-to-water heat pumps draw heat from groundwater. This is the most effective source of heat for heat pumps.

A well has to be drilled in order to tap into the heat source. The groundwater, whcih is always at a constant temperature, is pumped up in order to transfer its heat to the heat pump before being returned underground via a second well (the so-called return well). The heat pump pumps the recovered heat to the required temperature and heats the house.

Outstanding energy yield: For every kilowatt of electrical energy consumed a Weishaupt water-to-water heat pump recovers up to 5.5 kW of heat energy, putting it amongst the most efficient units on the market.

For any application: Weishaupt brine-to-water heat pumps are available in capacities ranging from 9 to 100 kW. High-temperature versions with flow temperatures up to 70 °C are available for the replacement of existing heating boilers or the renovation of older buildings without flat-panel radiators.

Extremely quiet: Weishaupt heat pumps are amongst the quietest available, thanks to their extensive vibration damping, completely sound-attenuated iinternal housing, and high-power compressor with no mechanically actuated valves.

For cooling too: Weishaupt's water-to-water heat pumps can be used for cooling as well as heating. "Passive cooling"in summer takes advantage of the constantly lower groundwater temperature to pass "cool" heating water through the system.

One-stop solution: All the accessories, from the Class-A-Efficiency pumps to the room thermostats, are designed to work together perfectly. Weishaupt also takes care of the well drilling and the connection to the heat pump system.

Easy-to-operate: The integrated controller with clear text display makes it easy to set the system in a few steps.

Complete heat supply: The heat pumps can also be used for domestic hot water. The Weishaupt Combistore (WKS) is a particularly elegant solution, combining cylinder, buffer tank, and all the connections between the heat pump, heating circuit, and DHW circuit within a single, compact housing

Long service life: High-quality materials, robust constructions, and tried-and-tested technology guarantee many years of reliable service. Thanks to their robustness, Weishaupt's water-to-water heat pumps are suitable for use with almost all qualities of water. A groundwater analysis is required in advance for heat ratings above 27 kW.

Eligible for subsidies: Weishaupt heat pumps are extremely efficient and therefore often eligible for energy subsidies. You can find which subsidies may be available to you in the Weishaupt subsidies database.

Energy efficiency

The familiar efficiency labelling of fridges, washing machines and televisions has now been extended to cover heating equipment. Both individual products and complete heating systems will be given energy efficiency labels.

The thinking: The labelling complies with European Union (EU) directives and is designed to give consumers a basis for comparison and thus to help them make informed decisions when buying heating systems. Consistent, standardised practice will be ensured by the predefined methods of calculation that have been laid down by the EU Commission.

Product label: Every boiler will receive what is known as a product label. This will state the energy efficiency for space and, where applicable, water heating. Other figures – such as sound power levels –  might also be given, depending on the heating system.

System label: If a complete system is being installed, e.g. a boiler with a temperature controller and a DHW cylinder, there will be a system label to show the energy efficiency of that system as a whole. This is usually better, as all the components have been matched to one another and expansions to the system, for example with solar collectors, have been taken into account.

Usefulness: The labels show the energy efficiency as defined by certain standards. However, this shouldn’t be the be-all and end-all when it comes to domestic heating. Many factors influence the energy efficiency and consumption of a heating system: How warm should the house be? How much hot water will be used? Is there underfloor heating? Purchasing decisions should therefore not be made solely on the basis of the energy efficiency label.

SystemEnergy efficiency class*
WWP W 10 - 22 ID A++ / A++
WWP W 35 - 65 ID A++ / A++

*Per EU Regulation No. 811/2013 seasonal space heating energy efficiency under average climate conditions, low-temperature (35 °C) / high-temperature (55 °C) applications

DHW cylinders

Weishaupt Combi Store: WKS

The Combi Store brings together within a single compact housing all of the components needed to integrate heat pumps with a heating system, thereby considerably reducing the amount of installation work required. It contains a 300-litre DHW cylinder, a 100-litre buffer tank, hydraulic components, circulation pumps, and electrical auxiliary heating. The Combi Store is designed for use with a large number of the Weishaupt heat pumps. (Energy efficiency class: B)


Weishaupt thermal store: WES-A 660/910, version C

Weishaupt thermal stores organise and distribute the heat produced by different energy sources (gas or oil-fired condensing boilers, heat pumps, solar collectors, solid-fuel boilers, or stoves) with an exemplary degree of efficiency. Inlet dampers ensure that the ideal temperature stratification is always maintained within the thermal store. Energy is also drawn off in an economical manner, with solar energy having priority over any other source.

WES 660 A-C

Weishaupt thermal store: WES 200-500 and WES 660/910, versions S and H

A simplified version of the thermal store for heat pumps without solar heating support. It has connections to the heating system (heating unit or heat pump) and additionally to a solid-fuel boiler, fireplace, or stove. Version S additionally offers solar DHW heating. (Energy efficiency class WES 200-300: B,  Energy efficiency class WES 500: C)

Weishaupt WES 200-500 Eco

The "Eco"-version cylinders offer increased energy efficiency. Their composite insulation with vacuum insulated panels and HDPU foam retains heat for longer. (Energy Efficiency Class: A)


Weishaupt thermal store: WES 100 - 140
This thermal store is designed as an under-set unit and serves as a buffer tank for heat pump systems, evenly releasing heat to a building's heat distribution system. (Energy efficiency class WES 100, 140: A, (Energy efficiency class WES 120: B)

WES eckig

Weishaupt Aqua Comfort: WAC 300-500

A classical water cylinder with a generously dimensioned heating coil for maximum DHW convenience. The large cylinder volume facilitates comfortable hot water temperatures and helps to save energy. (Energy efficiency class: WAC 300-400: B / WAC 500: C)

Weishaupt WAS 300-500

The "Eco"-version cylinders offer increased energy efficiency. Their composite insulation with vacuum insulated panels and HDPU foam retains heat for longer. (Energy Efficiency Class: A)


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