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  • 05-01-2015 3:55pm
    #1
    NurseBridie
    Registered Users, Registered Users 2 Posts: 66 ✭✭


    I have underfloor heating and currently my old boiler is on its last legs and may cut out with the result that the circulation pump starts pumping cold water around the house. I'm managing the situation and have plans to replace the boiler but I was wondering can you get a switch that only turns on the circulation pump when the water is above a certain temperature and would this mean that when the boiler has switched off the hot water will keep circulating until it cools down to a certain level. It has always annoyed me that the timer that controls my boiler may just switch if off after it has just finished firing and I lose out on the residual heat in the boiler which seems such a waste but a separate switch to control the circulation pump would solve this. Or for a new working boiler such a switch is not the effort of installing?


Comments

  • #2
    nmacc
    Registered Users, Registered Users 2 Posts: 459 ✭✭nmacc


    What you suggest can be done using a pipe thermostat, but you may have an issue with the wiring.

    To run the pump and suck the dregs of the heat from the boiler will mean taking the pump feed from a separate supply, as the existing supply will obviously shut down with the timeclock. I'm not sure of the electrical regulations involved (someone here will be), but if I were doing it I'd fuse it at 3A and it should be labelled clearly to prevent any unfortunate plumber or sparks getting a nasty surprise.

    Where you put the thermostat is important. If it is no longer run from the timeclock, then it will need to be in a position where natural convection will heat it quickly once the boiler is running. Setting it to a low temperature such as 45 degrees or so would probably also be a good idea.

    Odds are that someone on the Boards has done this already.


  • #3
    DGOBS
    Hosted Moderators Posts: 3,496 ✭✭✭DGOBS


    Is it a gas or an oil boiler?

    If oil, and you do as suggested above, do not have the overrun stat set to less than 55ºC as it may cause condensation to form in the ferrus part of the shiny new boiler that will corrode that part of the appliance rapidly.

    I do have an overrun on my appliance, it works very well, the wiring is pretty straight forward, as long as there is a permanent live available.


  • #4
    NurseBridie
    Registered Users, Registered Users 2 Posts: 66 ✭✭NurseBridie


    It is an oil condensing boiler and I don't think electricity will be a problem as the fuse board is above the boiler so I think wiring will not be a problem and I'm told the pipes have to all be moved as they are the other way round in condensing boilers.

    So are you saying that you put a pipe stat on the outflow pipe from the boiler and when it detects the temperature of the pipe to be 55 it will switch on the circulating pump and switch the circulating pump off when the temperature drops below 55.


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