Heating, cooling & DHW heat pumps

Heating, cooling & DHW heat pumps

Air to Water Heat Pumps for Heating, Cooling & DHW

Calorstaris an air to water heat pump supplier serving distributors, HVAC contractors, system integrators and project buyers. Our DC inverter systems provide winter space heating, summer hydronic cooling and domestic hot water (DHW) preparation through a coordinated water-based system.

The range includes R32 monoblock heat pumps, EVI air source heat pumps for cold climates, and configurations for underfloor heating, radiators and central heating systems. A suitable DHW cylinder, buffer tank and hydraulic controls can be matched to the selected unit and project requirements.

Explore our complete heat pump systemsor provide your operating conditions for model selection.

Select the Right Air to Water Heat Pump

Project Requirement	Recommended Solution	Main Selection Factors
New-build low-temperature heating	Inverter underfloor heating heat pump	A7/W35 performance, water flow and zoning
Radiator or heating-system retrofit	Monoblock heat pump for radiators	Building heat loss and capacity at higher water temperatures
Low outdoor design temperature	Cold climate EVI heat pump	Heating capacity and COP at the project design temperature
Heating, cooling and DHW	Reversible air to water heat pump	Fan coils, buffer tank, DHW cylinder and control priority

Underfloor heating normally benefits from lower leaving-water temperatures, while radiator projects must be checked against the required supply temperature and building heat loss. EVI models are recommended where dependable heating output is required under lower ambient conditions.

Performance Buyers Can Compare

Selected Calorstar R32 inverter models provide:

◆7.29–20.18 kW heating capacity at A7/W35

◆COP up to 5.01 at A7/W35

◆6.29–14.97 kW heating capacity at A7/W55

◆7.29–18.40 kW cooling capacity at A35/W18

◆Sound pressure levels from 48–51 dB(A) at 1 metre

Selected EVI air source heat pump configurations support operation at ambient temperatures down to -25°C and cover heating, cooling and DHW requirements. Actual performance depends on the model, outdoor temperature and required leaving-water temperature. Calorstar provides the relevant capacity, COP, water-flow and electrical data for project evaluation.

Why Source from Calorstar?

Climate-Specific Performance Testing

Calorstar’s temperature-controlled laboratory can simulate different climate conditions and supports performance testing according to EN14511. Products are developed and tested for applicable EN14511 and EN14825 requirements, with CE, UKCA, ErP and RoHS approvals according to model and destination market.

Controlled Production Quality

Our quality-control process includes OFN welding, two-stage vacuum preparation, calibrated refrigerant charging, three refrigerant leak tests, electrical safety testing and final operation at maximum running temperatures and pressures. These procedures help maintain consistent performance across OEM and volume orders.

OEM and Market Adaptation

Our OEM heat pump servicescan include:

◆Control interface and smart monitoring integration

◆Capacity, enclosure, colour and branding customization

◆Noise-reduction and vibration-control solutions

◆Protection for cold, humid or coastal environments

◆Multilingual manuals and customized packaging

◆Market-specific documentation and compliance support

◆ Integration with solar or existing hydronic systems

Contact our engineering teamto request product data, model matching and an OEM quotation.

Frequently Asked Questions

Can one air to water heat pump provide heating, cooling and DHW?

Depending on the selected model and hydraulic design, a reversible air to water heat pump can produce heating water, chilled water and domestic hot water through an indirect DHW cylinder. The controller manages operating modes and DHW priority.

When should an EVI heat pump be selected?

An EVI heat pump is suitable when heating must continue under low outdoor temperatures or when higher leaving-water temperatures are required. Selection should be based on tested capacity and COP at the project design point, rather than minimum operating temperature alone.

Can these heat pumps work with both underfloor heating and radiators?

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