modulating boiler

Hi All Vaillant ecotec 637 plus, S-plan external cylinder, eBus control. When in DHW mode the boiler acts weirdly as in it goes full on for ~5 seconds then minimum output for ~5 seconds and this forever until it stops. It's shooting for 75 degrees and with the behaviour of full on / full...

I am the proud owner of an Ideal Icos HE15 that is 17 years old and somehow still functioning. I know that this boiler cannot modulate down very well, but I have got it working reasonably well and have spent a decent amount of time getting the pump speed sorted & balancing the heating system...

Ive opened a can of worms by researching the heating system for our refurbishment. We are having a central heating system installed. The proposed boiler is a Vaillant ecoFIT pure (think 618 but not definite). The heating will have 3 underfloor heating circuits for two zones. Builder intends...

Hello everyone, first post and I can't find anything on the search function. I have just had a new WB Greenstar 8700 system boiler installed. It is controlled by an Easycontrol wireless thermostat. The plumber has been useless - installed it, switched it on and said let it run for a few days...

Hello, I'm using a chrono-proportional thermostat with a modulating combi boiler. I've read that this set up may not be efficient because of a conflict with the inbuilt boiler control logic and the TPI control, (return temperature and stuff I don't really understand). I've also read the...