"dkh" wrote in message
...
Just got a new cabin pak (external in an enclosure) warmflow 90-120 model
http://www.warmflowboilers.co.uk/pages/external.htm

the boiler manufacture recommends that frost stat is fitted but
dont specify a particular model.

I dont want something that will run the boiler continuously when the temp
gets below 3C say or the boiler will run all winter (as it doesnt heat up
the outside) so im guessing its possible to get some sort of frost pipe
stat which detects the pipes are warm enough ?

Anyone have any experience of this and can recommend something... have
already contacted warmflow once but they were rather vague....


dkh
Ideally you need an external waterproof frost stat located on the north side
of the house(no solar gain), this should be set at about 2 deg C and should
bring the pump on only (first stage). Secondly, you should have a pipe
thermostat located on the return pipe to boiler, this should fire up the
boiler if the pipe return temp drops to approx 10deg C, it should have a
wide differential (say 10deg C) so as not to have multiple starts on the
boiler.
Regards
Tom