Re: More on boilers

message from BillV on 16 May 2004

Thermostatic rad valve or some other method of controlling the room temp,
e.g. thermostat, is required now in every room, new build or refurb. You
don't really have to do this.
Fitters like to have TRVs in every room because it makes it easier for them
as they don't usually bother balancing the rads properly.
Condensing boilers will be required soon. When that happens you won't be
able to buy otherwise.

Modern boilers are able to modulate their power to fit the load so your last
statement doesn't apply.
Bear in mind that a condensor will probably not operate at full efficiency
except on the coldest days. Also with a condensor you will need those higher
output rads because the input temperature to the rads will be lower.

IMM replied to BillV on 16 May 2004

Not quite. Load compensation control on most condensers will take care of
rads designed to run at 80C. Once up to temp the boiler drops the
temperature flow temperature to the buildings heating load.

Andrew Welham replied to IMM on 17 May 2004

Thanks for the answers I will fit TRVs to all the rads except the bathroom

Any comments on the boiler types specified or the rads i an considering
full detials can be found in the post "Combies , corgo gas fitters, rads
and stuff"

Andrew

IMM replied to Andrew Welham on 17 May 2004

You will need a boiler "interlock". You need to have a stat or flowswitch
to detect when the house is up to temp and the boiler is switched off. Best
put a stat in the hall and no TRV there.

Archived message: Re: More on boilers (UK D-I-Y Home Decoration)