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Sounds a bit strange tbh, Likely to become illegal???/ How do you make a gas pipe that you haven't installed by yourself (an rgi) legal? If say you install a new boiler and that the current gas pipe is ok size and route wise but currently untested by yourself do you rip the whole run out...

Its not a Gas pipe until its connect to a gas supply though is it Tony?

Intresting thread.....only today did i just about finish installing a boiler for a customer after a week of roughing out 2 bathrooms and running all the central heating pipe work. Going back on monday to do showers,baths etc. Cored the flue hole, mounted boiler and made up the tails so far...

I like danfoss TRVs. Can't comment on the other ones you mention. The RAS-D variant comes in white/chrome and chrome. http://www.heatandplumb.com/acatalog/Ras-D2_Revolver_Thermostatic_Radiator_Valves.html

Any pictures of it all?

Over sizing the radiator will work fine also, a trv will take care of it. Rad sizing is only a guide anyway.

The diverter valve is malfunctioning, which boiler do you have? /me too slow Seco

Your right tony, my bad. :(

I would also just add a pump onto the DHW circuit. I can't make sense of your new pipe work either.

Not sure why air is getting in, in the first place but an automatic air vent could be installed on the bathroom radiator to get rid of the air. Not fixing the problem but treating the symptoms. http://www.heatandplumb.com/acatalog/copy_of_Aladdin_Autovent__Vertical_Radiators_.html

Your PRV is likely to give up the ghost also.

Read this: http://hypertextbook.com/physics/thermal/expansion/

Turn of the mains supply to the cwsc and f&e tank, Drain CWSC by running taps in your bathroom. Drain everything else down. Cylinder should have a drain cock somewhere also. Connect the mains supply directly to the coldwater pipe going into the bathroom. Remove the F&E pipes by...

Recently i have been re-plumbing a whole house and its new extension. The customer just had a new big combi fitted and is now wanting a programmer of some sort. The boiler as it is has no time related controls on board although it has a blanking plate for on board timer, customer wants to be...

For a house?

I doubt you will get a CC pan in there without moving the branch to the stack back to the wall, almost to the skirting board. Also modern cisterns have an internal overflow so no need to drill one to an outside wall.

Make sure the automatic air valve in the boiler is open (check the instructions), to bleed them pump unscrew the big silver screw in the middle until some water comes out. Do this when boiler is cold.

i make bungs out of denso tape, works fine for me.

Its a bit amateurish to use 2 elbows but it does work. Buy yourself a pipe bending spring (cheap) if you don't have a set of benders already.