M
Mike Jackson
Nice job ,, Can't see the balance valve on the cylinder return , !!!
Under Part L balance valves shouldn't be fitted to the hot water primaries. The balancing valve is to ensure that there is capacity to run the heating and hot water at the same time. Modern control systems allow the water heating to be timed earlier than the heating which enables a quicker more efficient heat up time with no detrimental effect on the heating.
i reckon it's an Apollo Fanfare being fitted.