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A hybrid heat pump combines a pellet boiler and a heat pump in one compact unit. Siemens control compares the cost of heat from both sources and automatically switches to the cheaper one. No manual adjustments needed – the system adapts to the current temperature, electricity tariff and pellet price.

Two sources, lower costs

The heat pump covers most of the heating season on its own. In severe frost, when its efficiency drops, the pellet boiler takes over. The result is operating costs 30–40% lower than a boiler or heat pump alone. And if there’s a power outage, the pellet boiler keeps heating.

Who is it for

Larger or older houses with a heat loss of 15–25 kW. Properties without gas. Renovations where you want a modern solution with a backup heat source. And for those who don’t want to depend solely on electricity.

Heat Pump Explorer

HOTJET ZETXe Air–Water 7 · 10 · 15 kW
Proven classic
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Reliable alternative to ZETXp
Same platform as ZETXp, proven by thousands of installations. Inverter, 3 circuits as standard.
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HOTJET ZETXp Air–Water 7 · 10 kW
The coming standard
R290
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Natural refrigerant R290, GWP 3
Natural R290 propane refrigerant with minimal climate impact. Ready for EU regulations beyond 2027.
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HOTJET 15-20 ZETXp Air–Water 15 · 20 kW
Higher output
R290
HOTJET 15-20 ZETXp
R290 propane for larger buildings
Three-phase 400V power, larger housing. For family homes, apartments and commercial buildings with 10–30 kW heat loss.
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HOTJET ZETXi Air–Water 10 · 15 kW
All indoors
HOTJET ZETXi
Complete indoor installation
No outdoor unit, no noise for neighbours. Ideal for terraced houses and dense residential areas.
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HOTJET Wx ground-to-water Ground–Water 7 · 10 · 15 kW
Ground–Water
HOTJET Wx
Most efficient, longest lifespan
Geothermal source = stable output all year round. SCOP over 5, lifespan 25+ years.
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HOTJET Wx water-to-water Water–Water 7 · 10 · 15 kW
Water–Water
HOTJET Wx Coax
No intermediate exchanger, direct output
Coaxial heat exchanger directly in the borehole. Fewer components, higher efficiency.
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HOTJET Mini Air–Water 5 kW
Compact
HOTJET Mini
Smallest air-source heat pump
Minimal dimensions, maximum output per m². Passive houses, low-energy buildings.
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HOTJET ONE2 Air–Water 20 · 25 · 35 · 45 · 55 kW
Indestructible
HOTJET ONE2
Simple. Robust. Reliable.
Minimal component count, maximum serviceability. Engineered to run trouble-free for years.
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HOTJET FW Accessories 70 kW
Accessory
HOTJET FW
Flow-through DHW module
Hygienic hot water without a tank. Plate heat exchanger 70 kW, flow rate 25 l/min.
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HOTJET HMD Accessories
Accessory
HOTJET HMD
Hydromodule – wall-mounted hydraulic unit
Complete solution in one cabinet: Siemens control, 7.5 kW electric boiler, circulation pump, 3-way valve and webserver.
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HOTJET RZ Accessories
Accessory
HOTJET RZ
Switchboard – control & protection
Electrical cabinet with Siemens control. Manages heating circuits, boiler, pumps and valves.
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HOTJET H25/10 Hybrid 10 + 25 kW
Hybrid
HOTJET H25/10
Pellet boiler + heat pump in one
Hybrid system: 25 kW pellet boiler + 10 kW heat pump. Siemens controller picks the cheapest source.
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