Air source heat pump

[Wish44]

Hi

I have just had a heat pump installed ( live in rural area no mains gas, was on heating oil) .

my house is 1900 with very very thick stone walls and a modern extension kitchen diner with ufh.

the problem i am having is that extension is consistently colder than rest of house which I am surprised by as it is all double glazed and stuffed with insulation- I am a bit sad about this to be honest as spent a lot on this . Anyway it means that if kitchen is a nice temperature the rest of the house is too hot .

my fitter insists that zoning makes it inefficient and doesn’t want me to do it.

anyone else got a situation similar /advice? Thanks

Can you explain more which type of system you have. We just fitted a mitsubishi system and have separate heat control in each room. Our fitter never mentioned zoning being something not to do.
Before it was fitted our rear extension always ran a bit colder using the gas central heating (which we left in situ so that we have choice to use either). Now the extension stays at the same temperature as the rest of the house, or whatever temperature it is set at when using the system.

ah that’s great you can have different temperatures in different rooms. There is no thermostat in my system it is done from the air temperature outside .

it’s a grant aerona

from your description you don't say you have ufh or radiators. if rads you should be able to adjust better.

Yes, if it's rads they want balancing. The installer should show you how to use the system as well.

How long has it been installed? Are we talking a day or two or more like a couple of weeks?

Heatpump systems tend to have to warm up the fabric of the house but at the beginning it’s a bit weird as the house warms up.

You are supposed to have a consistent temp everywhere in your house thats how to get the best efficiency out of your heat pump. It should be wild fluctuations as it costs more and takes long for it take raise temps

Is there no separate control for the UFH manifold? I have UFH in a modern extension and rads in the rest of the house (mainly 1930s) but different controls for each. So I can set different room temperatures and timings for them. UFH takes longer to warm up so I set it to come on earlier in the morning but once it’s warm the extension retains its heat better than the old part so it’s on for less time over the course of a day.

So I have ufh in the new extension and rads in the older part. However the rads only have trv in the bedrooms. So down stairs I can’t control them they are just on.

it got installed in the summer but only clicked on recently as it’s not been cold enough. I am presuming the house is still warm from summer. The house was still at 20 degrees up until last week from solar gain alone

we were told that for it to work best we need 3 radiators full on all the time.
so living room, bathroom and dc bedroom usually.
ours heats only to 45 degrees which means rads are warm but never hot.
this is not suitable if you use the pump also for hot water.
we found this is the most economical.

I think you need to get the fitter back. From the little I know about heat pumps, it's correct that zoning isn't usually a good idea. But it might be that the flow rate in your extension needs adjusting so that more heat is transferred.