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FWIW: I'm glad someone put him straight on suggesting a combi out of hand without a proper survey

Assuming you mean hot water cylinder: If it's heated by your boiler you may want to consider an Albion Superduty CF45 (45 Litre). http://albionwaterheaters.com/Superduty.html With a 30KW boiler (big than normal) it will recover from cold in 4 minutes or put another way: it will keep up...

Have any exploded in other countries where the fitters don't have to be certified? I think you'll find that they have.

Excellent. Thanks. I'll stick that link in my favourites. I don't do much repair work, mainly installs.

If you go for the fast recovery cylinder it is best to rewire the controls to Honeywell W Plan. So that the cylinder gets all the heat from the boiler when it needs it. This will speed recovery time (4 mins on smaller cylinder)

I have to change a cracked heat exchanger on a Pott Suprima 40. I have an old 60 lying around and need to know if the heat exchangers are the same. I can't find out online. Does anyone know?

Try 'Amersham Gas Services' Tel 01494 727566 Mave

We have been led to believe that it is Building regs to fit TRV's in the 'sleeping areas'. As I understand it, by following best practice we are guaranteed to comply with the regs, but not all best practice (including the TRV's) is in the regs.

"Invite as many Plumbing companies as you can endure....." Thanks for that!! I really appreciate being one of ten companies to quote for a job. It's wasting my time and that of the customers. Three quotes is more than enough. To answer the original question: I suggest Vaillant ecoTEC...

or someone with chronic bronchitis

Connect the flexi pipes. Open the hot side and see which pipe you can blow down. Easy!!

It sound like the gas valve sticking. After it's been on it's seat for a while it sticks. Once it's been freed it will open and close OK until it is left for few hours, then it sticks again. Although it would be sparking if that were the case.

You mean they do all those amazing things on their own ?!!!

I wouldn't install an unvented hot water cylinder and I'm a plumber and gas fitter. That's because I haven't got the ticket and wouldn't want to risk the thing exploding and possibly killing the occupants.

http://www.worcester-bosch.co.uk/index.php?fuseaction=product.literature&con_id=5057 This should help

http://content.honeywell.com/uk/homes/Catalogue/Sundial%20Plans/3.4%20Y%20Plan.pdf This link should help

FWIW: The final waste pipe looks like it's horizontal or maybe even inclined the wrong way.

Does the boiler get a bit noisy before cutting out? If so it's pos the overheat stat tripping, pos due to poor circulation, pos due to defective pump or clogged pipework/heat exchanger.

FWIW: You shouldn't be using compression joints if you're going to bury them. Better to solder and wrap in denzo tape.

Thats the one. You have an open vented sytem