Doctor Drivel wrote:
"." [email protected] wrote in message
...
Christian McArdle wrote:
discover I need TRV on ALL the rads rather tham all but one, and
a room stat into the bargain.

You are mistaken.

I'm not, well, I wasn't, it was the brother in law who said /all/
rads need TRVs
and the interweb said all but one. I was firmly with the web on that
one but
he disagreed. I thought that having two stats would confuse the
boiler.

I /must/ have a room stat so the front room will be the rad without
the TRV,
the only issue now is the cable run through the kitchen and behind
the skirting. if it is low voltage I shouldn't have a problem with
parts P & L

is that right ? I'm only using a cheap £5.99 bimetallic room stat.

To have TVRs on all rads one method is have an auto by-pass valve
fitted between the flow and return. Have a boiler which can maintain
a constant flow temp. Have a it set to 80C. Balance the system to
10C across the rads and boiler, if an existing system. Install a
pipe stat on the boiler return, so that the burner is off at 71C.

how about the cable run ?

what's your thoughts on that in relation to the various regs ?

tia