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whole house instantaneous water heating

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Comments

  • #32
    John T Carroll
    Closed Accounts Posts: 754 ✭✭✭John T Carroll


    Dardania wrote: »
    Fitted them a few months ago - noted comments on the thread that recommended them to me:

    http://www.boards.ie/vbulletin/showpost.php?p=96072616&postcount=28

    THis type: http://www.watersave.ie/product/eht10-electric-hot-water-tap/

    Thanks for that, its interesting the 8 to 10 sec delay in getting hot water but if you think about it its almost exactly a "mini" electric shower where one also has to wait around 10 secs for hot water.


  • #33
    BoatMad
    Registered Users, Registered Users 2 Posts: 10,506 ✭✭✭✭BoatMad


    John T Carroll wrote: »
    Thats fine but my only concern would still be if you only wanted say a hot water flowtate of say 0.5 LPM, how does the heater cater for this?, in an electric shower if one reduces the flowrate too much, a safety stat will open and close so you will get hot water one minute and cold water the next, obviously on the shower you just adjust the flowrate to avoid this happening but this would be very inconvenient/wasteful on a kitchen tap.

    can the thermostat in the heater not modulate to match the flow rate ?


  • #34
    John T Carroll
    Closed Accounts Posts: 754 ✭✭✭John T Carroll


    BoatMad wrote: »
    can the thermostat in the heater not modulate to match the flow rate ?

    Hopefully yes but its not as simple as storage tank temperature control as this is simply a electro/mechanical on/off device (thermostat) with a hysteresis of around 5C. The tankless heater control would have to switching on/off every few secs to maintain the required temperature and would probably be electronic in nature.


  • #35
    John T Carroll
    Closed Accounts Posts: 754 ✭✭✭John T Carroll


    BoatMad wrote: »
    can the thermostat in the heater not modulate to match the flow rate ?

    Just found another bit of info re that heater. Theres is no thermostat, just a overtemp stat that must be reset at the panel. It has 3 power settings, High, Medium and Low. It also has a minimum flow switch which interrupts the power if the flowrate is too low. All in all a bit inflexible in my opinion, but would/should certainly work when correctly set up.


  • #36
    BoatMad
    Registered Users, Registered Users 2 Posts: 10,506 ✭✭✭✭BoatMad


    John T Carroll wrote: »
    Just found another bit of info re that heater. Theres is no thermostat, just a overtemp stat that must be reset at the panel. It has 3 power settings, High, Medium and Low. It also has a minimum flow switch which interrupts the power if the flowrate is too low. All in all a bit inflexible in my opinion, but would/should certainly work when correctly set up.

    that wont work with thermostatic mixers so , thats no good for me


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  • #37
    John T Carroll
    Closed Accounts Posts: 754 ✭✭✭John T Carroll


    BoatMad wrote: »
    that wont work with thermostatic mixers so , thats no good for me

    The storage route is probably the best route as you suggested yourself, night rate electricity + well insulated cylinder if you are intent on going down the electric road.


  • #38
    BoatMad
    Registered Users, Registered Users 2 Posts: 10,506 ✭✭✭✭BoatMad


    John T Carroll wrote: »
    The storage route is probably the best route as you suggested yourself, night rate electricity + well insulated cylinder if you are intent on going down the electric road.

    yes confined by the manufacturer , not a solution , will have to investigate a unvented mains pressure hot water system


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