Distance from combi boiler. Make a difference?


Postby billybilly » Wed Mar 12, 2008 4:55 pm

I've an old house and therefore all radiators that I've fitted are double. My bathroom one is furthest from my large Alpha combi boiler. Its about 13m in 15mm pipe length....would this affect it getting hot? Seems to take ages to heat up, and not at all as hot as others. Bathroom is downstairs, boiler upstairs. Help !!
billybilly
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Postby ALDA » Wed Mar 12, 2008 7:56 pm

BB,

SYSTEM MAY JUST NEED BALANCING!!!
SPEED UP FLOW THROUGH RADS CLOSE TO BOILER AND SLOW FLOW THROUGH RADS FURTHEST FROM BOILER.

IF NO JOY, BOILER MIGHT NOT BE ABLE TO HANDLE LOTS OF DOUBLE RADS AND ASSOCIATED PIPE WORK!!!

IF YOU HAVE OR CAN GET BOILER INSTALLATION INSTRUCTIONS/MANUEL, THEN THIS WILL TELL YOU THE BOILER RATING AND FROM THAT YOU CAN ADD UP THE BTU VALUE OF EACH RAD TO SEE IF YOUR OVER THE MAX FOR THAT BOILER.

ALDA.
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Postby rosebery » Wed Mar 12, 2008 10:08 pm

Billy

13 metres shoul not be a problem.

First question. Is it a single pipe system or a dual pipe flow and return. If you've piped as single pipe then the rad furthest away from the boiler will always be coldest. If a single pipe you perhaps need to do some balancing.

Assuming it is dual pipe does it have a TRV? If so take the head off and see if the centre pin operates properly. If it's sticking that could be the problem. If it's an ordinary valve is it open enough? Is the lockshield valve at the other end of the rad closed?

If that doesn't work try turning off ALL other rads and see if it then gets hot.

If it doesn't then you probably have a blockage of some description or an airlock.

Try these first then come back.

Cheers
rosebery
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Postby htg engineer » Thu Mar 13, 2008 7:00 pm

Are there any other radiators connected to the 13m run of 15mm pipe ? or is the 13m of pipe just feeding for the bathroom radiator ?
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Postby billybilly » Thu Mar 13, 2008 8:03 pm

There are two other rads on the pipe, and I wondered if there should really be some 22mm pipe in there to get a little more water to share amongst the three rads.

The boiler has a heating output of over 100'000 BTU's.

Thoughts from the experts?
billybilly
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Postby htg engineer » Thu Mar 13, 2008 9:23 pm

Yes it should be 22mm with 15mm branches tee'd in for each radiator. This will be why it takes a while for the bathroom radiator to heat, if you're wanting to improve the performance - upgrade the pipe to 22mm as far as possible with 15mm branches.

hope this helps
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Joined: Tue May 22, 2007 5:22 pm


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