Using one boiler instead of two.

[bengasman]

then you go on to say meter volume has no bearing on maximum permitted leak rate ....

When are you finally going to read what I actually posted?

I didn't say the meter type is irrelvant to the permitted leak volume.

What I DID say was:
...A meter does not change how much gas escapes from an x-size leak...

AND

...a leak of around twice the maximum permissible size is HIGHLY UNLIKELY to cause a dangerous concentration in a NORMAL/STANDARD DOMESTIC HOUSE....

 

[Biggles..]

Ben,without wanting to join in this peeing contest,there was an article written just over a year ago for GI that created a leak just abOve the MPLR of a standard domestic u6 installation.the leak was in a floor/ceiling space and it was found that within a short period less than 4-8hours of standard living/use, the flammability levels and air/gas mixture was such that had their been q source of ignition the chances of explosion were highly likely.

Hence why the importance of how the pipe is ran/situated/ventilated also comes into account.

 

[Agile]

That might have followed an explosion in Birmingham where a very small gas leak over a period of time built up and explosive mixture which was eventually ignited by an electrical fault.

To the OP. The radiator sizes are irrelevant. Any combi boiler will be capable of heating two houses like that!

The point is the limited hot water output may or probably will not be judges as acceptable. Only the occupiers can decide that.

The solution would be a hot water cylinder heared by the remaining combi.

However, I am sure the correct solution is to repair the combi rather than spending a lot to remove it and adapt the system.

Few repairs cost more than £250 even if a new fan or gas valve is needed.

Tony

 

[bengasman]

Anything is possible Lee, but you need a leak in just the right place, in an enclosed area, with no ventilation, and it needs to be a pretty small place to get enough explosive mixture to make anything bigger than a good fart if the leak is around the maximum permissible.
I'd say we have more chance of seeing Ideal build top quality combis.

With a bit of luck I will finally have time to read that stuff you mentioned, after which I'll get back to you.

 

[commercialman]

...a leak of around twice the maximum permissible size is HIGHLY UNLIKELY to cause a dangerous concentration in a NORMAL/STANDARD DOMESTIC HOUSE....

Size of property is irrelevent , where the leak might be isn't.

 

[bengasman]

Did I refer to size anywhere?
I suppose small men always assume that.

 

[commercialman]

...a leak of around twice the maximum permissible size is HIGHLY UNLIKELY to cause a dangerous concentration in a NORMAL/STANDARD DOMESTIC HOUSE....

Let me rephrase , whether a NORMAL/STANDARD DOMESTIC HOUSE or smaller/larger dwellings a gas leak in a confined space could be well within flammability limits (4.4%-15% gas in air) , IGE/UP/1-1A has procedures put in place solely for this reason.

 

[Alson]

Can someone please advise me on this subject.

I have a Glowworm Combi serving 1st floor about 15 years now using 15mm copper. There is a later Eurocombi A23/A27 on the ground floor using 8 mm.

The Glowworm would cost too much to repair.

Would it be OK to do away with the Glowworm and use the shortest run to connect the 15mm to the Eurocombi ?

Thank you so much for your help.

Further information.

The house is middle terrace. Ground floor rads. 8mm, Front room 1200X500 Double: Back room 1000X600 Double and 800X500 Single, no outside walls: 700X500 Single, no outside walls: 480X290 Double: 600X500 Single: 800X500 Single: 1200X500 Single.

1st Floor rads. 15mm,
650X600 S: 650X400 D: 1200X400 D: 1200X400 D.

Thanks to everyone for all comments so far.

 

[gasafengineer]

Are these convector panels?

Total heat output of all radiators is 'roughly' 11kw/38kbtu , first floor radiator output works out to 'around' 4kw/13kbtu (convectors) , 15mm tube supplying 1st floor radiators should be fine in 'theory' dependant on length of runs , ground floor heat load would require 22mm tube.

Normally most installers would run 22mm from boiler spliting 22mm for ground floor along with 22mm for 1st floor , just good practice (balancing etc)