Community Centre: Help please

[Amigo4lavida]

We have had a Worcester 24SiII Combi fitted in our Village Hall for some 3 years. This is now losing all its pressure over a 24 hour period. We have checked all valves and exposed pipework for leaks as well as making sure the relief valve is not blowing off.
The rest of the pipework mild steel and copper is buried in the floor. Before we start replacing it is there anything we have overlooked.
If we do have to replace the pipework it can now be run in the roof space
(flat roofs replaced) Is plastic pipe suitably insulated OK or should we use copper.

Many thanks in anticipation
A4L

 

[ChrisR]

I'll be the first awkward sod. IF both thermostats in your boiler failed, plastic pipe could burst. Small chance but it does happen. In view of that I'd stick to copper, or add a third thermostat in your particular installation.

No really big deal, £50 or so including cable, conduit and stat and you just wire it in. I have done that where I've wanted to use plastic.

 

[lor]

rather than add a 3rd stat fit a flow switch. #have seen too many plastic pipe burst/leak to recommend . Rats love knawing them esp in lofts


ps youre never more than 6 feet away from a rat in London

 

[breezer]

i would get some one in, the boiler is in a public hall and you will probably invalidate your insurance should anything go wrong

 

[Amigo4lavida]

Thank you all for your help & advice.
We will start replacing the pipework section by section next week.
Breezer, we will be employing a Corgi approved installer.
Lor, will now be using copper pipe, we are in the country with hungry rats and mice; the thought of the poor devils being scalded if they eat through the pipe is just to horrible to contemplate

Regards
A4L

 

[Amigo4lavida]

Replaced first section of pipework yesterday, 40m. in total. Eureka! it seems we have cut out the leaking bit.

Regards
A4L