"R Taylor" wrote in message
...
with the gas feed running up the outside of the house.

is it legal ?

Yes, as long as it is metal pipe and protected from corrosions and damage
(cars backing into it, etc)

situation:

sime halstead running c/h and has been for a while with no problems
but the dhw supply is way below par. dhw is currently supplied by an
immersion heater in the bathroom. sime halstead currently in ground
flor utility room at the back of the house.

plan:

strip out immersion and cold water tank and install smallest, cheapest
combi boiler in a newly built cupboard to feed bathroom hot water and
kitchen which is situated directly below the bathroom.

A small combi will give poor flowrates. Small combi's are great for
showers. If you do mainly showers and the odd bath, then a small combi is
fine.

are there any legal issues with running a gas pipe up the outside of a
house

see above.

or siting a combi in a cupboard in a bathroom ?

No problem, as long as any electrical switches, or equipment is not
reachable by wet hands.