changing heating programmer?
Which is flow and which is return?
unable to light pilot on thorn m44/54b boiler?
Thorn tc3800 house alarm?
how can i fix my thorn M44/54 gas boiler?
Location of pilot light Thorn Housewarmer Super back boiler?
hot water but raidiaters cold?
thorn dusk to dawn lighting problem?
how do i run a thorn olympic efficiently?
We have a Thorn M gas boilder which is years old. Would it be safe to inst?
what boiler would i replace my thorn 44/54 with?
How do I light it?