22mm Gas Pipes and New Boiler

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On 13 Nov 2003 06:51:05 -0800, snipped-for-privacy@latentzero.com (Jo Silva) wrote:

Why dont you believe him ?

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Because I am cynical and don't believe everything I am told;)
No, if this is true then I am wandering how the current high output broken boiler ever got installed in there in the first place(it's not that old). When I bought the flat (two years ago) shouldn't the survey have indicated that this is a problem? The full run from the gas supply to the boiler is around 25 feet. It runs under my nice laminated glued down living room floor, thru to the kithcen to service the gas hob and then carries on to the boiler at the back of the house. I don't want to have to dig up my floor unless really necessary. But it looks like I will have to.
Thanks for all the replies,
Jo Silva.
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Incompetently, by the sounds of it. I suspect there will be well over the standard 1mb pressure drop, but some boilers can cope with low pressure without too much difficulty.

The survey wouldn't normally cover something like this. In fact, the survey normally has some lines such as "the heating system was not tested" or such like.
Christian.
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On Fri, 14 Nov 2003 11:38:06 +0000, Christian McArdle wrote:

Yep, Agree. The better surveys usually cover themselves with "if you are uncertain of the condition of the gas/heating/plumbing installation" you should obtain a report from a specialist.
Then it would depend on how thorough a specialist you got in.
The OP has not told us either the heat input of the old or proposed new boilers.
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Ed Sirett - Property maintainer and registered gas fitter.
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Hello Again,
Right, I've currently got a combi boiler with 93,00 ish BTUs. I have 5 rads, three small, one medium and one large (sorry I am not up on any special technical names for raditor sizes;)
I'm replacing the boiler, question is, is the current output adequate? Do I need more? Can it cope with less?
Once again,
All help appreciated in advance.
Cheers,
Jo.
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Yes
No
Less what? If you mean will a smaller boiler do, then a 24kW model should be more than adequate for your dwelling.

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No, yes. Even if your radiators are all running on maximum, you're probably not going to exceed say 25,000 BTU. However, you are a much more demanding user than your radiators because you want hot water now, not in a minute's time. So the question you should be asking is if you're happy with your domestic hot water output - i.e. is shower etcetera acceptable.
Ben
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Combi boilers are sized for the hot water usage. Unless you live in a converted 20 room hotel with holes where the windows should be, any combi boiler will have enough power for the heating. Your main concern with heating is how low the boiler can modulate down to, to avoid short cycling. This can be a concern with the 35+kW boilers, which often don't modulate as low as 24/28kW models.
Christian.
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