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Hot water tank installation

Discussion in 'Plumbing and Central Heating' started by brucep, 25 Jul 2008.

  1. brucep


    24 Jul 2008
    Thanks Received:
    United Kingdom
    I had a new hot water tank and pipes installed a few months ago, and looking through the installation guide, there are few things I don’t quite understand.

    The cylinder is a Hot Spring “Dual Fuel” unvented type, with a 300 litre capacity. It has two coils, the second of which connects into a solar panel. The wiring diagram for connecting up the boiler, programmer, thermostat etc shows a 3rd motorized valve, fitted in line with the solar panel pipe, to stop circulation if the stat temperature is exceeded. This hasn’t been done and I’m assuming it’s because the solar panel controller has it’s own pre-set safety limit, which automatically switches off the pump, stopping circulation. Would I be correct in assuming this?

    The installation guide states that the expansion vessel can be fitted to either the top of the cylinder or onto the cold water inlet pipe (after the expansion relief valve). If the capacity is 200 litres or more, the vessel must go on the inlet. Mine is fitted to the top of the cylinder. Could this be a problem?

    Lastly, should the cold water feed to the shower, bath, taps etc be taken from the balanced take-off point? Mine isn’t, and on the connection diagram, where it indicates the BTO point, my plumber has circled it and written ‘BTO ?’. Is this ok?

    Out of interest, I’ve seen some PRV’s with a 3rd pipe connected to them. What is this for? The PRV I’ve got looks as though it could have a 3rd connection, but it’s blanked off. I initially thought it was the BTO point but the connection diagram shows this as after the PRV, before the check valve.

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