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I use ply as mdf tends to go bad quicker when exposed to moisture - i find... but i dare say others may have a different opinion. Never had any problems with ply.

Awesome stuff - well done. Glad to have helped.

As above really... turn off all rads - then if heat reaches the dodgy rad just turn lockshields on about 1/8th of a turn on other rads... Google/you tube ‘balancing radiators’ - follow their guidance.

When the heat exchanger is first made it’s done so using a process involving sand... this grit can be sand particles left over from the manufacturing process ... or just build up of flecks of byproducts from years of use - as above; condensate is slightly acidic too. Either way, Perfectly...

Six of one and half a dozen... Yup - I take your point. Whenever i install its just something I do. Force of habit and a result of doing these worcester courses i reckon. I only ever really do worcesters on installs to be honest... i don’t mind doing ideal/baxi et al - but i guess it’s...

Flow pressure switch fault...? Needing masses of flow to get the thing to fire up on hw..? On something that old a call to worcester is the correct call probably...

Seal gone. Part not immediately available Spilling POC. Correct call by british gas, them’s the regs. If i had to wait a few days for a part to arrive in this instance you’d have to cap it... Shame they ‘cocked up’ - you do wonder about installer incentives though.

Vertex flue? Yeah - engineer not correct in my mind. Post above is quite correct. Check condensate is draining if it is then a flue integrity check would be next stop.

In this instance Feel free to shoot me down guys. Worcester bosch training used a general rule of thumb of 1.5kw per rad plus 10% for fittings for heating side (not set in stone - but to help with calcs..) Assuming correct incoming pressure boilers should be sized on hw output. I have a...