Boiler connection 22mm

[Chuck]

I don’t think it is a rad size issue as the rads don’t get hot, only warm. The house is quite warm as we keep the heating on 24 hrs.

A numbered list of questions for you, as requested:

Qn 1. How much gas the boiler is using when it is on with the thermostat up to 23 degrees? (Take two gas meter readings an hour apart and report the values here.)

Qn2. What is the Central Heating Water target temperature set by the controls on the boiler?

Q3. What is the Central Heating Water flow temperature being reported on the boiler display?

Q4. Is the 'heating demand' light (it's blue on a Worcester Bosch boiler, which is what I think you must have) on continuously?

Q5. Can you hear the boiler shutting down after running for a few minutes, then waiting a while and then firing up again in a cycle while the blue demand light remains lit?

 

[king of pipes]

A 16 year old combi boiler is old its quite possible the pump is getting weak and its performance is dropping off you have a heating engineer get him to gas rate the boiler on high rate see how much heat its delivering a few pictures of the boiler may also help. Kop

 

[Last Plumber]

An experienced Heating Engineer should easily be able to come to a conclusion with this based on his/her knowledge.

If the rads are not getting warm enough, the cause could be a multitude of things.

I don't think you'll get the answers to your problem on a forum because the people you are talking to have not seen or tested your installation and there are too many possibilities with this kind of fault.

It could be a boiler issue - one of many - or indeed an installation problem. whether that be undersized pipework, partial blockages or other restrictions, short circuiting etc. it really needs an accurate diagnosis.

I think the best thing is to find a highly recommended Engineer and trust their conclusions or suggestions based on the results of their investigations.

Flow and return temperatures are always a good place to start with these things in my opinion, as they will give a good indication of where to start looking.

I hope this helps.