Siting a boiler

[jon1968]

Just in the midst of a rough outline of a kitchen redesign. What are the regs regarding re-siting a new combi boiler near an existing gas hob? Is there a minimum distance?

Currently have 430mm from the right edge of hob to a R/H wall with 1550mm ceiling to hob/worktop height?
Don't worry, I'm not doing it myself, just trying to plan!

Many thanks.

[gasman]

It can be positioned a mininum of 650mm above a hob with a hood and a min of 700mm without a hood or a minimum of 420mm higher if it is to be sited 50mm away from the vertical edge of the hob. The gas supply pipes could not of course be routed in the vicinity of the hob.

[gucciman]

gasman, did you read my reply about the expansion vessel in the alpha boiler post?


could you actually site a boiler above hob cooker hood? i would have thoughtthe boiler would be thru the roof if you did?

[gasman]

Hi gucciman, Just read the Alpha ( spit ) post, couldnt have put it better myself well done mate.
You would not normally site a boiler above a hood as ceiling height is an issue as you say, but theoretically you could. There is no regulation to say you couldnt but i agree you would need very high ceilings to comply, And jon1968 only asked for the regs regarding siting the boiler in relation to the hob. Nice to see you are still posting. Now i am back in the country again i shall be a bit more active again myself. keep up the training and good work.

[jon1968]

Brilliant, thank you Gasman, time for a rethink! Hopefully you�re still following your answers? Couple of questions for either yourself or Gucciman�

Is it possible to extend the �stand pipe� for the gas cooker at all or does it have to be resited. Could I use the feed for the existing boiler as the feed for a gas cooker if I resite the hob to where the boiler is now? (doubtful!)

I�m thinking it�s probably easiest to just site the new wall mounted boiler directly above the existing one utilising the existing pipework and leave the hob where it is but that�d mean the boiler would be c.2000mm from the wall I want to vent it through although I can reduce that distance if necessary with a bit more work and a change in the chimney demolition schedule. What are the regs on the distance from the wall? Will it have enough draw or does that depend on the boiler?

I�m not doing anything �til the Summer but was hoping to get all the boiler work done with minimum disruption and build the rest of the kitchen around it.

Many thanks for any help, just trying to sort the logistics.

[gucciman]

not sure what you mean by standpipe, presuming you mean the gas supply pipe where the cooker flex plugs into then yes they can be extended fairly easily, any pipework is best done when before the new kitchen units go in as it makes our life a lot easier.

if you fed the gas cooker from the same supply pipe as the boiler then you will find that if your cooking and the boiler comes on it will rob the cooker of gas and could be potentially dangerous if you had a gas ring on simmer and it went out when the boiler came on and then when the boiler went off the gas was still coming thru the cooker ring.

its the total length of flue that is important and its normally 3 mts with a fan flued boiler, this figure is reduced if you have bends in the flue run. you can have a longer flue length if you have 2 seperate pipes for the flue rather than the std twin wall flue.

i dont know from your post what your old or new boiler is but note that combis use a lot of gas and you will need a minimum of 22mm gas supply from the meter to it, so if your old boiler is on 15mm it will prob need upgrading.

[gasman]

Gucciman is correct again about the Flue ( vent as you put it ) length been 3000mm max and upto 11000mm using the twin pipe method. In order to avoid the unaccepable example that gucciman describes about one appliance robbing another one of gas, the pipework installation has to be carefully sized accordingly and must be able to supply enough gas for all appliances it serves. This may mean upgrading the gas pipes as far back as from where it leaves the meter. You're Gasman will advise you on this when they come to survey the job and will quote you accordingly.
The stand pipe is just a minor thing and can easily be extended with minimum of fuss and disruption.

[jon1968]

Many thanks Gucciman and Gasman, I wasn�t intending to �share� the feed, but maybe swap the feed from one to the other if necessary. It�s a pain �cause it�s for a smallish (14� x 8�) dual aspect kitchen so there�s not much wall space except on the back wall.

The current conventional boiler is on the floor in an existing chimney stack on the back wall (which was obviously put in when boilers were bigger) and the stack dominates the kitchen and hogs unnecessary space - even the 10+ yo Mexic unit they have is dwarfed in it! As boiler technology has moved on the grand plan is to resite the boiler with a smaller wall mounted combi unit and binning the immersion tank giving them a bigger airing cupboard, vent the boiler through the wall rather than the roof and knock down the chimney to free up some space (it�s in a bungalow by the way so not as monumental job as it sounds).

Was intending to have the new boiler put up where a wall mounted cupboard is to the right of the hob (hence my original question) but based on your advice I�d need a very narrow or very thin boiler! Lol (why is nothing easy!?)

Anyways, many thanks for your advice.