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Dual immersion heating element on Horstmann timer

  • 25-06-2016 8:53pm
    #1
    Andy454
    Registered Users, Registered Users 2 Posts: 312 ✭✭


    I have a standard dual immersion heater that is controlled via a Horstmann e7 timer:

    The bath element is connected to off peak timer
    The sink element is connected to the boost timer

    The minimum time you can set the bath element for is for 4 hours!! Which is crazy because the element only takes about 1.5 hours to heat the tank.

    4 hours is far too long, I can hear the tank thermostat cycling on and off from 4am if I set the timer to finish at 6 am.

    If I set the timer to come on at 6am and forget to turn it off it heats a full tank again after showers have all been had!

    I was thinking of fitting a Horstamann series 2 h37xl using two channels wired to two contactors for controlling the dual element heater, but trial wiring reveals that both elements could be activated together which would probably breech the load of the supply circuit. Is it possible to prevent one channel from activating if another channel is ON, on this programmer, or do I have to install another (normally closed) contactor to open circuit on the boost side when the main unit is on?


Comments

  • #2
    Sleeper12
    Registered Users, Registered Users 2 Posts: 17,189 ✭✭✭✭Sleeper12


    Andy454 wrote:
    4 hours is far too long, I can hear the tank thermostat cycling on and off from 4am if I set the timer to finish at 6 am.


    This shouldn't happen with an insulated cylinder. A cylinder with an inch of foam shouldn't lose more than 1 degree or so of heat overnight assuming the hot tap isn't used.

    I've never been a fan of these horseman timers. I prefer a sink bath switch with a sangamo timer. Apart from a digital timer it has a boost button. Boost 30 minutes, 60 minutes and 120 minutes


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