I had a gas safety check on a Bosch 24i combi and the man said that the
pressure relief pipework was sub-standard as it simply runs from the boiler
to the floor with the exit inside rather than an external exit.

Can someone please tell me what the Building Regs require as I am thinking
of correcting this myself (especially as the main work is do drill a hole)?
EG is it 15mm or 22mm pipe, what are restrictions on the exit, such as is it
downward facing etc etc.

Also where could I read or access these regs?

I even have the original Bosch Installation instructions but they dont
mention this pipework beyond the boiler

Thanks

Simon

"Mitch" wrote in message
...
I had a gas safety check on a Bosch 24i combi and the man said that the
pressure relief pipework was sub-standard as it simply runs from the
boiler
to the floor with the exit inside rather than an external exit.

Can someone please tell me what the Building Regs require as I am thinking
of correcting this myself (especially as the main work is do drill a
hole)?
EG is it 15mm or 22mm pipe, what are restrictions on the exit, such as is
it
downward facing etc etc.



Also where could I read or access these regs?


I don't know which regs cover it - it certainly should be in the
manufacturer's installation instructions - but it should terminate outside a
few inches from, and facing, the ground; so that if/when the pressure relief
valve opens the blast of potentially boiling water + steam can hit the
ground without injuring anyone. 15mm is generally used.

I even have the original Bosch Installation instructions but they dont
mention this pipework beyond the boiler



--
John Stumbles
-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-|-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
-+
a town is never big enough to support one lawyer but it can always support
two

"Mitch" wrote in message
...
I had a gas safety check on a Bosch 24i combi and the man said that the
pressure relief pipework was sub-standard as it simply runs from the
boiler
to the floor with the exit inside rather than an external exit.

Can someone please tell me what the Building Regs require as I am thinking
of correcting this myself (especially as the main work is do drill a
hole)?
EG is it 15mm or 22mm pipe, what are restrictions on the exit, such as is
it
downward facing etc etc.

Also where could I read or access these regs?

I even have the original Bosch Installation instructions but they dont
mention this pipework beyond the boiler

Thanks

Simon

It is 15mm pipe and easy enough to do yourself. The pipe runs outside then
is supposed to go to within a few inches of the ground, but if the boiler is
high up in your building, that may not be practicle, so use common sense
that any escaping HOT water will not spray over anyone below.
HTH
ROb

John Stumbles wrote:
"Mitch" wrote in message
...
I had a gas safety check on a Bosch 24i combi and the man said that
the pressure relief pipework was sub-standard as it simply runs from
the boiler to the floor with the exit inside rather than an external
exit.

Can someone please tell me what the Building Regs require as I am
thinking of correcting this myself (especially as the main work is
do drill a hole)? EG is it 15mm or 22mm pipe, what are restrictions
on the exit, such as is it downward facing etc etc.



Also where could I read or access these regs?


I don't know which regs cover it - it certainly should be in the
manufacturer's installation instructions - but it should terminate
outside a few inches from, and facing, the ground; so that if/when
the pressure relief valve opens the blast of potentially boiling
water + steam can hit the ground without injuring anyone. 15mm is
generally used.

I even have the original Bosch Installation instructions but they
dont mention this pipework beyond the boiler

Yes, they are normally 15mm. The hole should be drilled so there is a slight
slope downwards from inside to outside.
On the outside its normal for the outlet to be turned back towards the wall
with say a 90 and a 45 degree bends.
This is to avoid scalding anybody who may be near the outlet when the relief
valve lifts.

Thanks for advice - let the drilling commence!

"Kalico" wrote in message
...
"Mitch" wrote in message
...
I had a gas safety check on a Bosch 24i combi and the man said that the
pressure relief pipework was sub-standard as it simply runs from the
boiler
to the floor with the exit inside rather than an external exit.

Can someone please tell me what the Building Regs require as I am
thinking
of correcting this myself (especially as the main work is do drill a
hole)?
EG is it 15mm or 22mm pipe, what are restrictions on the exit, such as
is
it
downward facing etc etc.

Also where could I read or access these regs?

I even have the original Bosch Installation instructions but they dont
mention this pipework beyond the boiler

Thanks

Simon

It is 15mm pipe and easy enough to do yourself. The pipe runs outside
then
is supposed to go to within a few inches of the ground, but if the boiler
is
high up in your building, that may not be practicle, so use common sense
that any escaping HOT water will not spray over anyone below.
HTH
ROb

"Mitch" wrote in message
...
I had a gas safety check on a Bosch 24i combi and the man said that the
pressure relief pipework was sub-standard as it simply runs from the
boiler
to the floor with the exit inside rather than an external exit.

Can someone please tell me what the Building Regs require as I am thinking
of correcting this myself (especially as the main work is do drill a
hole)?
EG is it 15mm or 22mm pipe, what are restrictions on the exit, such as is
it
downward facing etc etc.

Also where could I read or access these regs?

I even have the original Bosch Installation instructions but they dont
mention this pipework beyond the boiler

Thanks

Simon

Don't know about regs but my Vaillant (28kW) instructions say that it must
vent
outside, must be as short as possible, not lesss than 15mm diameter, with a
continuous fall away from the boiler [ since it doesn't specify a slope, in
effect
I took it to mean that the pipe shouldn't actually go uphill at any point ],
that the
vent should terminate in a position which would not cause a hazard to
persons
due to discharge of water or steam, nor cause damage to any electrical
components
or external wiring, and the point of discharge should be clearly visible.

My old combi position was a first floor bedroom, and the vent
exited the
cavity wall horizontally about 20 feet up. I've just installed a new combi
in my
old outside loo and have the discharge pipe exit the wall, and immediately
turn
through 90 degrees and discharge into a gully at the side of the house.

Andy

"John Stumbles" ] wrote in message
...
"Mitch" wrote in message
...
I had a gas safety check on a Bosch 24i combi and the man said that the
pressure relief pipework was sub-standard as it simply runs from the
boiler
to the floor with the exit inside rather than an external exit.

Can someone please tell me what the Building Regs require as I am
thinking
of correcting this myself (especially as the main work is do drill a
hole)?
EG is it 15mm or 22mm pipe, what are restrictions on the exit, such as
is
it
downward facing etc etc.

Also where could I read or access these regs?

I don't know which regs cover it - it certainly should be in the
manufacturer's installation instructions - but it should terminate outside
a
few inches from, and facing, the ground; so that if/when the pressure
relief
valve opens the blast of potentially boiling water + steam can hit the
ground without injuring anyone. 15mm is generally used.

Not quite. 15mm pipe, outside at a low level and the pipe being turned into
the wall using an elbow. If boiling water/steam is lets off it hits the
wall. The pipe need not be sleeved going through the wall.


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"IMM" wrote in message
...

"John Stumbles" ] wrote in message
...
"Mitch" wrote in message
...
I had a gas safety check on a Bosch 24i combi and the man said that
the
pressure relief pipework was sub-standard as it simply runs from the
boiler
to the floor with the exit inside rather than an external exit.

Can someone please tell me what the Building Regs require as I am
thinking
of correcting this myself (especially as the main work is do drill a
hole)?
EG is it 15mm or 22mm pipe, what are restrictions on the exit, such as
is
it
downward facing etc etc.

Also where could I read or access these regs?

I don't know which regs cover it - it certainly should be in the
manufacturer's installation instructions - but it should terminate
outside
a
few inches from, and facing, the ground; so that if/when the pressure
relief
valve opens the blast of potentially boiling water + steam can hit the
ground without injuring anyone. 15mm is generally used.

Not quite. 15mm pipe, outside at a low level and the pipe being turned
into
the wall using an elbow. If boiling water/steam is lets off it hits the
wall. The pipe need not be sleeved going through the wall.

Also you can terminate inside a garage (integral garage or not). There
again at low level and the pipe turning into the wall. It can terminate
onto a flat roof too, one gains at low level and turning into the wall.




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"Mitch" wrote in message
...

Thanks for advice - let the drilling commence!

The pipe can drop down inside and penetrate the wall at low level to the
outside. External pipes can look very ugly.


---
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