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Immersion coil balancing

  • 26-01-2016 12:26pm
    #1
    phester28
    Registered Users, Registered Users 2 Posts: 470 ✭✭


    Just a quick question. I have a modern modulating boiler and 2 zone heating. The wife said that she thought the immersion tank was taking longer to heat up recently. I have tried opening the gate valve an extra turn.

    I took temperature reading of 63 in and 56 out. From what I am seeing the boiler is doing its job. The coil is getting flow.

    I was initially thinking if the gate valve was open too much it would stop the heat being conducted into the tank but surly if the water goes round and round the net effect is the same?

    Am I correct in saying the limiting factor is the heat dissipation of the coil and nothing (easy) can be done to fix.


Comments

  • #2
    John T Carroll
    Closed Accounts Posts: 757 ✭✭✭John T Carroll


    phester28 wrote: »
    Just a quick question. I have a modern modulating boiler and 2 zone heating. The wife said that she thought the immersion tank was taking longer to heat up recently. I have tried opening the gate valve an extra turn.

    I took temperature reading of 63 in and 56 out. From what I am seeing the boiler is doing its job. The coil is getting flow.

    I was initially thinking if the gate valve was open too much it would stop the heat being conducted into the tank but surly if the water goes round and round the net effect is the same?

    Am I correct in saying the limiting factor is the heat dissipation of the coil and nothing (easy) can be done to fix.

    The greater the flowrate through the coil, the faster the cylinder will heat up. In general, I would think that if the 3/4 ins ballancing valve is more than 1 turn open that you should get a reasonably fast heat up. The balancing valve on mine has been less than 1/2 turn open for years now and I did check the heat up period years ago as well and it took 55 minutes to heat 100 litres from 25C to 55C, Boiler water (= coil) temp averages 70C, cutin/cutout 65C/75C.


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