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 Though they should have issued a "Not to CurrentStandards" notice regarding the low pressure.) On a (probably more modern)boiler requiring a burner pressure closer to the inlet pressure then low inlet pressure could cause an incorrect gas mixture and incorrect combustion which would be a safety...

I think you should look.at having the boiler moved. You cant have flue pipes external. All flue joints need to be accessable for inspection. And terminal needs to be 500 mm from wall. Get a qualified installer to look at it. I would have you boiler moved into the main loft.

The fires are visually the same. Its the back boilers that are differant. The fire is made for a newer model BBU. So the 552 needs the adapted version of the fire. They dont manufacture the fires now. But you can still buy them new. Check the gas council numbers. You need 37~075~04. If its the...

How old is the system?

The VP3 will not fit the 552. You need the Bermuda VP3 Renewal GC no. 37~075~04. It is same as Vp3 but modified to fit the 552, as it is a older bermuda design

There should be a pressure regulator fitted to the supply to your unvented cylinder. Connecting there should give you more of a equal hot and cold pressure.

Do you notice if pressure shoots up fairly quickly when boiler working on pressure guage

Is the cold feed pipe connected between the vent pipe and pump?

You can fit flow restrictors in the shower outlet

Does the pilot flame reach the thermocouple tip

It would prob be better on the landing

Overrun is pump overrun which keeps pump running for 5 mins. And fan purge runs to get any products of combustion or unburn gas out which can be acidic

Where does the vent pipe to the f&e tank tee onto the system

central heating return thermister fault

some trv need to be on flow side of rad

the 30 maybe bit too big, maybe a 28 or 24junior would do, alot smaller, still give good flow rates and bout 200 cheaper

maybe replacing the air sep for nwer one, of using the H wud work. i usually take the one u have out

u can get pumping over if the vent isnt high enough over the tank water level, at least 18 inches

the pipe need protecting from frost with insulated lagging, on making condence pipe bigger size