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Check your boiler stat isnt up way to high as this will encourage pressure drop over shorter period See how many times you can boil a kettle before it boils dry

unless you buy a 30kw combi you are wasting your time

use the plastic key that fits onto the small hex and just turn

is it a fully pumped system are the motorized valves working The pump may be broken ,even if it is making a noise The bathroom rad is probably on the hot water circuit

if you have a good mains pressure in your property you should opt for a Albion Thermal store. They are cheaper, low maintenance and exempt from Building control

you dont need a safety valve on an oil fired boiler. a 22mm vent will be ample and unlikely to block. Solid fuel appliances used safety valves because u had no control over the heat build up and some had 15mm vents. With modern boilers you have safety devices like thermostats, high limit...

There is no rule for port valves.U can use either a three port or two 2 ports Normally three ports are used when no room stat is evident. There are two types of three port. Mid position and diverter i prefer two 2 port valves

yes the fan is the problem

faulty three port valve

is your system pressurized or tank fed have you got any automatic air vents in the Airing cupboard

do away with it. they are not necessary anyway

most thermostatic valves are bi directional and can go either end as can return valves

Replacing ballvalve washer or complete ballvalve should cure. Badly clipped pipework can also make the noise worse

There are companies that specialise in dis continued colours although i cannot give you any details. A plumbers merchant may help you

some washing machines have check valves built in and some dont you can buy valves with integral checks built in Some water autoritys insist on check valves fitted

Thin wall lagging is best as it protect the pipes and allows for expansion. Pipes should be laid in a purpose built duct

Air lock

Boiler thermostat faulty Coil in Cylinder broken and leaking Ballvalve in Exp tank dripping Pump speed to high Blockage in System Pump installed in correctly