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comfortably_numb
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Joined: 29 Oct 2007
Posts: 87
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 Posted: Sun Sep 28, 2008 7:22 pm Post subject: Boxing a Worcester Combination boiler in ???? |
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Hi Folks.
I'm hoping to box our boiler in. Its Worcester Combination boiler situated in our utility room.
Is there any regulations in regards ventilation etc that i need to be aware of ?? I've checked the manual but it doesn't state anything
Many Thanks |
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2 user(s) is/are thankful for this post.
Bludall(28-09, 21:16), thescruff(28-09, 21:35), Thanks comfortably_numb for his/her post
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thescruff
Senior Member
Joined: 10 Mar 2008
Posts: 5721
Location: Bath
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| Posted: Sun Sep 28, 2008 7:38 pm Post subject: |
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Other than you have to get at it once a year for a service, and regular maintenance checks.
model would be good as well
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Scruff |
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comfortably_numb
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Joined: 29 Oct 2007
Posts: 87
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| Posted: Sun Sep 28, 2008 8:15 pm Post subject: |
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| Its a ZWB 7-25 R 25 HE according to the Installation & service instructions booklet |
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Bludall
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Joined: 11 Apr 2007
Posts: 8785
Location: East Midlands
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| Posted: Sun Sep 28, 2008 8:18 pm Post subject: |
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Every time British Gas come to service our boiler, A Worcester combi, there's yet another regulation about ventilation. We had a boiler cupboard, big enough to fit a tumble dryer in. It needed louvre vents above the door and at the bottom of the door to allow enough ventilation and they had to be a certain size. We got so fed up we removed the door in the end!
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thescruff
Senior Member
Joined: 10 Mar 2008
Posts: 5721
Location: Bath
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| Posted: Sun Sep 28, 2008 8:31 pm Post subject: |
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BS 6798, I will see what BS 5440-2 has to say on the matter.
5.3.1 General
The space around the boiler shall be at least the minimum specified in the manufacturer’s installation
instructions.
The floor or wall on which the boiler is to be mounted shall be protected as detailed in the manufacturer’s
instructions.
COMMENTARY AND RECOMMENDATIONS ON 5.3.1
The space around the boiler should be adequate:
a) to ensure sufficient air circulation for any draught diverter to operate;
b) to ensure sufficient air for combustion and cooling;
c) for maintenance and servicing.
5.3.2 Boiler compartment installations
5.3.2.1 The boiler compartment shall be a fixed rigid structure, the internal surfaces of which conform to
the boiler installation instructions.
COMMENTARY AND RECOMMENDATIONS ON 5.3.2.1
If the boiler manufacturer’s installation instructions do not give specific advice, then any internal surface of
the boiler compartment which is of combustible material should either be at least 75 mm from any part of
the boiler or should be lined with non-combustible material. Methods of determining whether a material
may be described as combustible or non-combustible are given in BS 476-22. For further advice, see HSE
publication Safety in the installation and use of gas systems and appliances [8].
5.3.2.2 The compartment shall incorporate air vents for cooling and, where necessary, to provide air for
combustion and correct operation of the flue (see 5.1 and 5.2).
5.3.2.3 The compartment shall permit access for inspection and servicing of the boiler and any ancillary
equipment. A notice shall be fixed in a prominent position within the compartment to warn against its use
as a storage cupboard. The compartment shall be fitted with a door that will permit withdrawal of the boiler
and any ancillary equipment.
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Scruff |
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thescruff
Senior Member
Joined: 10 Mar 2008
Posts: 5721
Location: Bath
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| Posted: Sun Sep 28, 2008 8:33 pm Post subject: |
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| Bludall wrote: |
| Every time British Gas come to service our boiler, A Worcester combi, there's yet another regulation about ventilation. We had a boiler cupboard, big enough to fit a tumble dryer in. It needed louvre vents above the door and at the bottom of the door to allow enough ventilation and they had to be a certain size. We got so fed up we removed the door in the end! |
Not applicable Blu, in fact it would be interesting to know what boiler you have.
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Scruff |
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thescruff
Senior Member
Joined: 10 Mar 2008
Posts: 5721
Location: Bath
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| Posted: Sun Sep 28, 2008 8:44 pm Post subject: |
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Nothing in BS 5440-2 say you can't provided you keep the minimum clearances.
Any good reason why you want to box it in. 
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Scruff |
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Bludall
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Joined: 11 Apr 2007
Posts: 8785
Location: East Midlands
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| Posted: Sun Sep 28, 2008 9:01 pm Post subject: |
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Scruff,
Our boiler is a Worcester 9.24 Electronic BF, about 15 years old.
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thescruff
Senior Member
Joined: 10 Mar 2008
Posts: 5721
Location: Bath
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| Posted: Sun Sep 28, 2008 9:08 pm Post subject: |
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Yep you need cooling vents Blu.
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Scruff |
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comfortably_numb
Member
Joined: 29 Oct 2007
Posts: 87
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| Posted: Sun Sep 28, 2008 11:39 pm Post subject: |
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Ok .... I have found a set of User Instructions online. The manufacturers requirements & clearances reads as follows
Left-hand side 5 mm
Right-hand side 5 mm
In Front 600 mm
Above Casing (Vert. Flue) 200 mm
Above Flue Turret 30 mm
Below 200 mm
Am i right in thinking that this is for acess purposes, so the cupboard can go as close as 5mm either side, The front needs to allow 600mm (i'm assuming this does not have to be a permanent 600mm but a door opening would suffice so can get front of boiler front off ??)
I'm completely lost on last 3 requirements
Above Casing (Vert. Flue) 200 mm
Above Flue Turret 30 mm
Below 200 mm.
It then goes onto
Ventilation
This is a room sealed appliance and does not require any air for
combustion from inside the house. If the appliance is fitted into a
cupboard or a compartment is built around the appliance after
installation then the compartment must be separated from the
boiler space by a perforated non-combustible partition as
described in BS6798.
Notwithstanding the requirements of BS6798, there is no need
for ventilation openings to be provided in the compartment
because of the low heat loss from the casing.
Do not allow the flue terminal fitted on the outside wall to become
obstructed or damaged.
Can a anyone descirbe this too me in simple English please ??? |
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thescruff
Senior Member
Joined: 10 Mar 2008
Posts: 5721
Location: Bath
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| Posted: Sun Sep 28, 2008 11:55 pm Post subject: |
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I think you missed a post 
BS 6798 I copied above is what you have to comply with, because the manufacturer has stated you don't need cooling ventilation you can ignore 5.3.2.2.
Although to comply with the 200mm above the case, it is normal to not fill in the roof of the boxing.
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Scruff |
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thescruff
Senior Member
Joined: 10 Mar 2008
Posts: 5721
Location: Bath
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| Posted: Mon Sep 29, 2008 12:06 am Post subject: |
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Let me explain that a bit simpler.
What the manufacturer is saying is yes you can box it in, with the limits of the measurements, e.g. 5mm either side, 200mm on the top, & 200mm below, with 600mm access to the front which can be the door.
What BS 6798 is saying is that is fine, provided you use a fire resistant board, otherwise the gaps must be a minimum 75mm from any combustible material. for example if you use MDF board.
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Scruff |
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comfortably_numb
Member
Joined: 29 Oct 2007
Posts: 87
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| Posted: Mon Sep 29, 2008 10:27 am Post subject: |
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| thescruff wrote: |
Let me explain that a bit simpler.
What the manufacturer is saying is yes you can box it in, with the limits of the measurements, e.g. 5mm either side, 200mm on the top, & 200mm below, with 600mm access to the front which can be the door.
What BS 6798 is saying is that is fine, provided you use a fire resistant board, otherwise the gaps must be a minimum 75mm from any combustible material. for example if you use MDF board. |
Thankyou .... thats the kinda language i understand  |
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