Pipe stat: flow or return pipe?

[Will_S]

I recently had a boiler service and the man who did it suggested switching the pipe stat from the return to the flow pipe.

He suggested this after I mentioned the heating was coming on during the night (inc all radiators) for extended periods.

Having searched a few threads, it seems the advice is to attach it to the return pipe. Mine's now on the flow pipe and the heating doesn't come on for as long as before, but I'm concerned my frost protection may be comprimised!

Any thoughts?

 

[glasgowgas]

i take it your pipestat is for frost protection?

what temp is it set for??

 

[Will_S]

Yes, it's for frost protection (it's hooked up direct to a frost stat).

It's currently at 10c - and by the look of it that's as low as it goes...

 

[glasgowgas]

is your boiler in a loft or unheated space?

if so, as soon as pipe temp hits 10 deg c or below, it fires up boiler, heat distributes through pipework, when stat hits probably 12/13 deg c boiler goes off

because its on the flow this will warm up quicker than the return will

hence your boiler runs for less time in frost protection mode, but importantly still providing frost protection

 

[Will_S]

It's in the garage.

My only real concern is that everywhere seems to say it should be connected to the return pipe. Not sure why, though - surely connecting it to the flow pipe is a better option (unless you like your whole house heating up periodically throughout the night).

 

[kevplumb]

connect to flow

protects boiler

connect to return

protects full system

think about it

mind what would a thick plastic confederate know ?

 

[gas4you]

I agree with Kev.

On the return. This will be the coolest pipe so needs protecting more.

 

[Will_S]

OK - thanks for your help.