Oil boiler install and G3 regs

Good start !! :-)

Not that they could refuse.

Why go for a pressurised system ?

And if you do, the name of the body is the local building control. If you are competant in this area, they are there for you to show that it's right - no need for third parties.

I think you'll have been there but if not have a look at

I couldn't find your specific query except the throwaway line "Note: Separate qualifications are required for installations involving unvented hot water storage covered by Advisory Document G3" at

Presumably you intend to use a standard manufacturers oil fired boiler as the primary source of heat? If so your boiler will need to be fitted with a control thermostat backed up by an overheat stat. The boiler manufacturer will supply the unit with overheat stat already fitted if the boiler is approved for use on a sealed system hence they are the ones to provide you with the verification of conformation. However if the BCO is really asking for conformity with respect to an unvented system hot water cylinder you should approach the cylinder manufacturers although AIUI all unvented cylinder installations must be by registered installers which makes his query redundant. In any case if the cylinder is heated by a primary coil containing boiler water the only way for the cylinder to achieve over 100 degrees C is for the boiler to overheat above this temperature and produce superheated water or steam, both of which require two stats to fail sequentially. In the case of an open vented primary or secondary overheating above 100 degrees is "highly" unlikely due to the laws of physics and the boiling point of unpressurised water

Not any more. The ODPM has rescinded this requirement after many complaints. For once they have listened to competant DIYers. Likewise you can install your OWN gas equipment - though not anybody else's.

I've had a reply this morning to an email I sent to a guy at Worcestor boilers. This states that the Heatslave combi's are excempt from G3 of the Building Regulations as it contains less than 15 litres of mains pressure water. The stored water within the appliance is of primary water held within a thermal store which is also not part of G3 coverage.

So looks like I can submit the form now and make start.

Thanks for the info and links supplied.

Jimmy

Jimmy Gibs> Hi,