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Remove, rip out, bin, destroy etc. etc. (Get the idea? :) ) Replace with decent ones like Fluidmaster

Motorised valve???

True, T&E in the long term will degrade due to UV. However this is over many years. On the mobile classroom installations mentioned we rarely had any problems (out of several hundred units) and mostly it was due to the taping used to hold the cable to the wire, neither did we have trouble with...

We always ran overhead supplies to mobile classrooms in schools in 6 or 10mm T&E on a catenary! Saved digging up the playground. SWA would be best and ideally underground if possible.

Recommend shifting the 3 rads onto the rest of the heating system as suggested. Also move feed tank cold feed and vent pipes onto suction side of pump 6" apart. Probably need to put a manual air vent on the flow pipe to vent the rise to the cylinder. I would also recommend putting a bypass...

500 l/h??? Works out at about 6kW. Sounds a bit low to me. Is the diverter valve inside the boiler working? (I believe you said Linea Max, combi boiler?). Download the manual http://www.vokera.co.uk/trade-professionals/manuals-literature/ and go through the section on operation (section 2)...

Erm... is somebody getting confused between system head and pressure drop? :wink: The pump should be sized to the system: your pipe losses will be around 0.009m/metre run for 28mm pipe at 12.5l/min so the bit of pipe from boiler to pump will have a total drop of 0.043m, PLUS the drop through...

Trouble is village halls & the like aren't flush with cash to spend on heating, so two boilers would be out of the question. I've done loads of small schools and generally only a single boiler in each as they're quite reliable (and budget is ALWAYS an issue). Basic boiler is recommended as some...

Pump?

I'm looking for a pressure/booster set for a small commercial installation. The place has a private water supply gravity fed from further up the hill and at the moment there are three bathrooms plus basins in 4 of the bedrooms, 3 WCs and 2 sinks plus the usual washing machine & dishwasher. When...

I agree, other bits that could be considered: take it whoever looked at the boiler checked the pressure off the meter when it was running? Had a couple of school meters where the regulator was stuck and pressure low. Some boilers (usually older atmospheric ones) can go down as low as 5" wg...

Suggest Vaillant Ecotec, had a few fitted and good reports all round. If you want to keep the open vented system you'll need minimum 1m head above the boiler (according to Vaillant, but best go for more iff poss) otherwise go for the sealed system version (with a village hall you'll need...

I'd be surprised if just the temperature change in the house was bumping the cold pressure up that much, unless you have a faulty expansion vessel, but then the relief valve'd be popping all the time. Could be the filling valve letting by I had a similar problem on my previous boiler when I...