Villa · R290

Caldo BoostR290 heat pump for radiators and renovations

Caldo Boost is an R290 heat pump for villas that heats system water up to 70 °C, a temperature suited to radiators and renovation projects. With a natural refrigerant, four models from 8 to 22 kW and operation down to −25 °C, it provides heating, cooling and domestic hot water with an SCOP of up to 4.69.

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Villas · large homes

Caldorelli Caldo Boost air-to-water heat pump

8–22 kWCapacity

R290Refrigerant

−25 °CMin. ambient temp.

75 °CMax. water temp.

Applications

Where it fits

Home comfort with natural R290 refrigerant, Wi-Fi control and hot water up to 75°C.

Villas with existing radiators
Heating system renovation projects
Large homes with underfloor heating
Households with high hot water demand

Radiators up to 70 °C

The heating circuit runs on water from 20 to 70 °C, and the series reaches a maximum water temperature of 75 °C. A sound basis for radiators and renovation work.

Natural R290 refrigerant

R290 (propane) has a very low GWP. Because it is flammable (class A3), installation and servicing must be carried out by qualified technicians.

SCOP up to 4.69

Under EN 14825, SCOP at 35 °C flow ranges from 4.60 to 4.69 (ηs up to 184.6%). At 55 °C flow it stays between 3.37 and 3.55.

Hot water and Wi-Fi

Produces 159 to 377 litres of hot water per hour depending on the model, with Wi-Fi and IoT control. It uses a Highly compressor and a Shimge water pump.

Made for your project

Technical data

Technical data are nominal values under standard test conditions. Actual performance may vary. Specifications may change without notice.

Operating range−25~43°C

Hot water20~60°C

Heating water20~70°C

Cooling water7~35°C

CompressorHighly

Water pumpShimge

Swipe to explore all specifications.

Model	8 kW	11 kW	15 kW	22 kW
Heating capacity (kW) · 30/35°C	3.3~8.3	4.5~11.4	5.9~14.8	8.8~22.0
Heating power input (kW)	0.64~2.18	0.85~2.95	1.13~3.83	1.68~5.77
COP	3.81~5.17	3.86~5.29	3.86~5.22	3.81~5.24
DHW capacity (kW) · 15/55°C	3.7~7.4	5.2~10.2	6.6~13.2	7.8~17.6
DHW COP	3.52~4.69	3.55~4.71	3.54~4.67	3.51~4.66
Heated water output (L/h)	159	219	283	377
Cooling capacity (kW)	2.4~5.8	3.3~8.2	4.3~10.8	6.2~15.3
EER	2.65~3.04	2.67~3.06	2.71~3.10	2.73~3.12
ηs / SCOP · 35°C outlet	182.7% / 4.64	181.0% / 4.6	182.9% / 4.65	184.6% / 4.69
ηs / SCOP · 55°C outlet	136.0% / 3.48	137.0% / 3.5	131.9% / 3.37	138.9% / 3.55
Noise dB(A) @1 m	44	43	45	45
Power supply	230V/1Ph/50–60Hz	230V/1Ph/50–60Hz	230V/1Ph/50–60Hz	380V/3Ph/50–60Hz
Max. power input (kW)	3.1	4.1	5.2	7.6
Max. current (A)	14.2	18.8	23.8	14.3
Water flow (m³/h)	1.43	1.96	2.55	3.78
Net weight (kg)	112	120	138	170
Unit dimensions (mm)	1080×460×820	1080×460×960	1080×480×1060	1080×480×1372
Refrigerant	R290/1.0kg	R290/0.95kg	R290/1.45kg	R290/1.4kg

Full 2026 catalogue (PDF)

How to choose the right model

There are four models: 8, 11 and 15 kW on a 230 V single-phase supply, and 22 kW on a 380 V three-phase supply. Heating capacity at 30/35 °C runs from 3.3–8.3 kW on the smallest model to 8.8–22.0 kW on the largest, while hot water output rises from 159 to 377 litres per hour. With radiators, allow for a higher water temperature and an SCOP of 3.37–3.55 at 55 °C. Have a qualified installer confirm the final sizing.

See the full buying guide

Caldo Boost

Frequently asked questions

Straight answers on how heat pumps work, efficiency, installation and choosing a Caldorelli series.

Talk to a specialist

Is the Caldo Boost a good heat pump for radiators?

Yes, it is the series designed for that job: the heating circuit runs on water from 20 to 70 °C. Radiators typically work at temperatures such as 55 °C, where the Caldo Boost still achieves an SCOP of 3.37 to 3.55 under EN 14825. An installer should check that your existing radiators heat each room well.

Why choose an R290 heat pump?

R290 is propane, a natural refrigerant with a very low GWP, which reduces the system's environmental impact. In the Caldo Boost the charge ranges from 0.95 to 1.45 kg depending on the model. Because it is flammable (class A3), installation must respect safety distances and be carried out by qualified technicians.

How much hot water does the Caldo Boost produce?

It delivers 159 L/h with the 8 kW model, 219 L/h with the 11 kW, 283 L/h with the 15 kW and 377 L/h with the 22 kW. Under 15/55 °C test conditions, DHW COP ranges from 3.51 to 4.71. Hot water is stored in a cylinder such as the Solitank or Enamel TSE-VS HP.

Can the Caldo Boost also cool?

Yes. It is reversible and produces chilled water from 7 to 35 °C, with cooling capacity from 2.4–5.8 kW on the 8 kW model to 6.2–15.3 kW on the 22 kW, and an EER of 2.65 to 3.12. Cooling is delivered through fan coils or underfloor systems designed for cooling.