In normal circumstances the CH system will require a much higher input than the HW, when the hot water cylinder is cold then the coil may absorb 10 Kw but as water temperature approaches 60C then the coil may only be absorbing ~ 2 kw hence more cycling but every 30 secs is certainly not normal, one might expect ~ 3 to 5 mins. It could point to a lime scaled coil if you live in a hard water area or a very poor circulation rate through the coil for whatever reason.
What is your boiler output?.
What is your boiler output?.
Last edited:
