Plumbing and Heating specialists

[paulcockermouth]

We have had a couple of extensions done to our house last year (and finally finsihed!!) and now the colder weather is here I am concerned my combi boiler is not up to the job....

We originally had 8 radiators in 6 rooms (1 bathroom)
We now have 15 radiators in 11 rooms (2 bathrooms) total BTU of radiators is approx 65000 (based on knowing exact BTU of new radiators and estimating the (old) radiators based on internet searches)

It is a bungalow (with a 2 story extension 1 side) boiler is roughly 1/3 way down house in kitchen and 3 rooms one side and 7 the other (including the 2 story extension).

We have a Worcester 30si combi condensing boiler with an output of around 85000 but our problem is radiators that do not heat fully up (especially furthest from boiler). I have made all the radiators bleed many times but they are still not heating up.

My question is simple - should my boiler have enough 'power' to feed all these radiators? If not what would be a suggestion?
If it is powerful enough what else could the problem be?(balancing?)

Thanks in advance....

[B17NNS]

Before ditching your (very good) boiler, try balancing the rads.

http://www.diydoctor.org.uk/projects/balancingcent...

[Ferg]

The answer lies (probably) in how the extension was tee-'d into the existing system. If the pipework was sized correctly for the property and extra rads were tacked on, then it may well struggle to get flow to the furthest without having the nearest rads cranked right down. This, in itself, may well cause other problems.
Have a go at balancing it, try 11 degrees between flow and return.