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I didn't mention that HW temperature control is not set to full but only to 3/4 however when boiler comes on it will heat to a maximum 80C and then cuts out and on again. Also after draining the system, refilling and bleeding radiators hot water became much hotter then previously. Dose...

Just wanted to put you in the picture, you know sharing domestic responsibilities. :D

What about discaler etc? Which should I use? And is it legal to clean your heat exchanger?

I'm going to drain the CH system tomorrow and refill to see if it helps. I know its not a powerflush but I need to see if it will help for now. Which discaler or inhibitor or both should I use when refilling and at what point?

Hi As it happens I'm the DIY person in the house and my husband dose the cooking. Can you help guys? My Baxi Combi 105e is 3 years old. All was fine until 6 months ago when pressure started to creep up on a gauge (even to 3.5 bar-I had to use safety valve to release it) and water...