Heat 10x faster
Heats usable hot water in under 30 minutes – 10x faster than conventional heat pump cylinders.
iHP X
The high-efficiency heat pump cylinder for all-electric homes
The award winning Mixergy iHP X is SAP-optimised integrated heat pump cylinder designed for modern developments using direct electric heating.
Winner of the King’s Enterprise Award for Innovation 2025
The indoor heat pump for hot water
iHP X delivers high-efficiency, low-carbon hot water — without needing an external heat pump.
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3x More Efficient: Integrated R290 heat pump dramatically reduces electricity use compared to standard electric cylinders.
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Fast Hot Water: Boost mode heats usable hot water in under 30 minutes — perfect for peak demand.
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Modular design: The head unit can be removed for easier handling on tight installs or stairs.
Small and quiet
Non-intrusive, the heat pump head unit has a low noise level and can be a third smaller.
Standalone unit
No need to connect to a boiler, external heat pump, or central system.
Futureproofing an all-electric home with the Mixergy iHP X
Tim and Kat installed the iHP X to power their new gas-free home with low-carbon hot water. Paired with solar PV, it gives them fast, efficient heating, reduced bills, and smart control that fits their lifestyle today — and tomorrow.
Noise was a big thought for me, but its absolutely fine. Even in a cupboard, the Mixergy iHP is quiet. We’ve never this much data before with a hot water system, I’ve never been able to see how much energy we’re generating.
Laurence Haslop, Homeowner and MD, Develroy Ltd.
Technical data
The following table displays technical data for the Mixergy iHP X cylinders with a capacity of 120-250L and using the R290 refrigerant.
| Sizes | 120L-250L |
|---|---|
| Coefficient of performance (CoP) | 3.4 |
| ErP rating | A+ |
| Refrigerant | R290 |
| Minimum reheat time (15-50C) | 30 mins |
| Sound pressure level (dBA) | 50 |
| Achievable hot water temp via heat pump | 55°C |
| Height (mm) | 1325-2145 |
| Diameter (mm) | 580 |
| See full technical details | iHP X Datasheet |
Mixergy X
Faster, efficient, and future-ready. The smart, flexible hot water for any energy system.
Solar X
Maximise solar PV use, cut bills, and boost compliance with our SAP-ready cylinder.
Cube X
A compact cylinder designed for tight spaces and ideal for social housing retrofits.
