New boiler and radiators, should we go for underfloor heating?

[SteamyTea]

13 hours ago, JohnMo said:

discussion is about a gas boiler

I forgot that.

[LDNRennovation]

I’m not totally following but are people suggesting a heat pump rather than a gas combi? The house has a gas cooker and fire. We were going to replace those units but stick with gas but I’m not married to the idea.

[SteamyTea]

29 minutes ago, LDNRennovation said:

gas cooker

Apart from the recent Which report about internal air quality from gas hobs/cookers, an induction hob is so much better to cook on. Ovens are a bit more complicated as gas ovens have higher humidity, which can be a benefit. 

You will save the daily standing charge by not having a gas connection, but as the property is already connected, reconnection would not be prohibitively expensive.

 

[JohnMo]

36 minutes ago, LDNRennovation said:

I’m not totally following but are people suggesting a heat pump rather than a gas combi? The house has a gas cooker and fire. We were going to replace those units but stick with gas but I’m not married to the idea.

Basically what ever you can do with a heat pump you can do with boiler. Low and slow heating is best for both options. A good boiler and good system design will be cheap to run and give a comfortable house. A boiler running at 70 degs heat rads quickly is a bad design, bit like an on off switch instead of accelerator in a car. A good heating system design is more like cruise control in comparison.

 

Designed right a gas boiler heating system could simply swop over to a heat pump if you wanted at a later date.

 

As mentioned previously if set on a combi do a storage combi. Or do a system boiler and unvented cylinder, on priority demand hot water.

 

Do a room by room heat loss calculation. Design radiator to have max flow temp of say 45 at say -5. Set boiler to run weather compensation and let it run, no need to do set back temperature, do it from the boiler controls.

 

If you went system boiler and unvented cylinder, set up a priority demand hot water, so the boiler runs at low temperature for heating and higher temperatures for cylinder heating. Use a heat pump cylinder, these have a big (3m² plus) heating coil, which gives rapid reheats of cylinder.