Hi all,

I’m currently assessing options for a low-energy / airtight self-build and am looking at integrated systems such as the PKOM4 (MVHR with integrated heat pump for space heating/cooling and DHW).

There’s plenty of manufacturer and installer material available, but I’m finding very little UK-based post-occupancy feedback from owners, so I’m hoping someone here has direct experience.

If anyone on BuildHub has a PKOM4 installed in a UK home, I’d be very interested in hearing how it performs in practice, particularly:

• Space heating performance

  • How well does it maintain internal temperatures in a typical UK winter?

  • Any reliance on backup heating?

• Cooling / summer comfort

  • Does the system provide meaningful cooling, or is it closer to comfort tempering via supply air?

• DHW performance

  • Capacity and recovery times in day-to-day use?

• Running costs

  • Annual electricity consumption and seasonal performance?

• Noise and usability

  • Internal noise levels (fans/compressor) and control interface?

• Reliability and servicing

  • Faults, maintenance requirements, UK support and spares availability?

• With hindsight

  • Would you specify it again, or opt for a more modular approach (separate MVHR + ASHP + cylinder)?

My main question is whether the integration and space saving genuinely justify the cost and complexity versus a conventional split system in the UK context.

Happy to hear from owners, designers, or installers with real-world experience.

Thanks in advance.

No experience but would make this comment, one part fails no heating, maybe no hot water or ventilation.

 

Keep them separate.

 

I'm moving towards, direct cylinder heat with off peak electricity, on separate controls from ASHP, so stand alone control (simple immersion timer)

Simple ASHP install, just doing UFH and or fan coils on weather compensation.

Separate MVHR, no heat or cool.

 

All simple cheap to install, one bit fails, easy to replace.

9 hours ago, Philippa01 said:

My main question is whether the integration and space saving genuinely justify the cost and complexity versus a conventional split system in the UK context.

This question came up last week, although I don't think the appliance was named.