The compact hybrid combination

Light, compact and energy-efficient air-to-water heat pump for existing homes

From the aroTHERM split and aroTHERM plus monobloc to the flexoTHERM and geoTHERM: Vaillant offers a comprehensive range of heat pumps that efficiently and energetically convert renewable energy from the sun, soil and outdoor air into domestic heat. Since July, the aroTHERM pure air-to-water heat pump has additionally been available. "With the aroTHERM pure, we are responding to the growing demand for hybrid setups," says Manager Product Management Ronald Mazurel. "During development, we focused not only on cost-effective heating and compact design, but also on simple and fast installation. In doing so, we serve both residents and installers extremely well."

The aroTHERM pure outdoor unit has a floor area of only half a square meter, making it the smallest air-to-water heat pump in Vaillant's range. "Whether in single-family houses or apartments, the aroTHERM pure is a perfect solution for anyone who wants a space-saving but cost-effective heat pump solution," Mazurel said. "Thanks to its compact size and with outputs of 4, 6, 8 and 10 kW (at an outdoor temperature of +7°C), a suitable hybrid heat pump system can be designed for every type of home."

Significant time savings

With the development, Vaillant is anticipating the growing demand for hybrid heat pumps, which will be the minimum standard for home heating starting in 2026. But also to the growing shortage of technically skilled personnel. "By opting for a split arrangement, installation is simple and fast," Mazurel emphasizes. "The 'entry-level heat pump' consists of a compact outdoor unit and a simple indoor unit, between which technicians with F-gas certification sec need to lay the refrigerant lines. The time savings achieved compared to a monobloc system allows heat pump technicians to install significantly faster." R32, which has a Global Warming Potential (GWP) of 675, was chosen as the refrigerant, he says. "The heat pump gets its energy (heat) from the outside air. Thanks to the use of R32, evaporation occurs even at very low outdoor temperatures down to -25°C."

Most economical option

The aroTHERM pure air/water heat pump can be perfectly combined with Vaillant's compact ecoFIT pro boiler. "But third-party boilers are also possible," says Mazurel. "In a hybrid setup, the available supply of renewable energy is optimally utilized. For example, our triVAI hybrid manager offers the possibility of specifying both the current gas and electricity price. Based on the outside temperature, the controller then calculates what is the most economically advantageous option: turning on the heat pump or using the boiler for space heating. This allows residents to make optimal savings on their energy costs without sacrificing comfort."

All-electric ready

As desired, the indoor unit of the aroTHERM pure system can be installed with or without a backup heater. "With a backup heater, residents are optimally prepared for an all-electric future. In addition to hybrid, the aroTHERM pure can also be used as an all-electric solution in combination with our uniTOWER pure hydraulic tower for domestic hot water. This indoor unit is about the size of a refrigerator. All the necessary system components, such as the hot water cylinder and backup heating, are already built in. Thanks to top-mounted connections, it is particularly practical to mount this unit directly against the wall."

Also for hot water

The 190 liter boiler in the uniTOWER pure provides a reliable hot water supply for households of up to four people, says Mazurel. Do more than four people live in the house or do you simply need more hot water? Then the aroTHERM pure can be combined with the Vaillant uniSTOR DHW cylinders. 

"This combination with a hydraulic module can provide up to 500 liters of hot water for about eight people."

The sensoNET app allows residents to control their entire system via smartphone. "This requires only the sensoCOMFORT system controller and sensoNET gateway," Mazurel concludes. "All functions can be set easily and quickly in the app, from any location, after which even greater savings become possible."