We have an EAHP; it has issues.

I'm considering getting a monobloc, and decoupling the radiator system from the EAHP. So the EAHP is only for hot water & ventilation.

3 questions about monoblocs:

Do they have to stand on concrete? Suitable places at our house are all wooden deck affairs.

Must I have glycol in the radiator pipes in case of stoppages (it can go down to -20 here ...)?

Would it be feasible to just turn the whole thing off in the summer? It's a noise/vibe thing - our outdoor seating area is often completely still & quiet in summer apart from the occasional rustle of Aspen leaves

I would suggest that all 3 questions are best suited to ask the manufacturer of your chosen machine as they will want the install specs. to their standard to ensure the guarantee.

Thanks WillinAberdeen (and the others too, of course :)

I think it's anti-freeze valves here too, but will check with they who sell ...

Great to know that you can turn them off; we don't need heating 3 months of the year; I get irritated by our EAHP which has to be on all the time, despite our lack of need of heating, hot water and constant-flow ventilation ...

I wonder if it's ok to say this on the forum, but I really miss having a gas boiler! But heatpumps are theoretically more environmentally friendly here in Sweden, because the electricity is 100% renewable (apart from the odd very cold day)

I had decking where my ASHP went so I simply removed a section and built a couple of blockwork pillars on simple footings at right angles to the wall I then bolted timber onto the blockwork and sat the heat pump on thick standard rubber aircon vibration mounts the whole lot ended up just above the level of the decking.

These are what I used but there a lots of different designs, check the weight loadings.

https://www.ac-one.co.uk/rubber-flexi-feet-mounting-block-foot-11895-p.asp