Zoning a heating system

D-Generate

Hi,

We bought a house recently which has a combi-boiler. The majority of the house is old (1890s) and heated by radiators but the extension is new (2011) with underfloor heating and superior insulation. We are currently finding that although the extension may be hot, older parts of the house are cooler. Rather than keeping the heating on and going to both, we would love if there was a way to switch off the heat supply to the extension whilst keeping the heat going to the old parts of the house. In time we will seek to improve the insulation in the older parts of the house.

I think what we need to do is zone the two areas and have one thermostat in the extension and one in the older part of the house. The pipes to the underfloor heating are accessible under the combi-boiler so I am hopeful that this is feasible.

Could anyone give me an idea as to whether I am on the right path in my thinking? Also, is this a costly or reasonably inexpensive job (i.e. < €300)?

Thanks

whizbang

You probably already have some sort of valve system on the underfloor;
if so, simply reduce the flow to underfloor, to balance the house/extension.

Adjust a little bit at a time until; it seems ok, then decide if it needs additional controls or not. Most likely not.

Dardania

You're right in your thinking - this is a reasonable approach.

It depends upon accessibility of pipework and proximity to the boiler among other things (for wiring). less than E300 light be optimistic - I'd be more the mid to high hundreds.
SEAI have grants for this you should check out, and they give good specs to follow: https://www.seai.ie/grants/home-grants/better-energy-homes/heating-upgrade-grants/

D-Generate

Thanks for the help