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nicknorman

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nicknorman last won the day on April 13

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  • Gender
    Male
  • Location
    Aberdeen
  • Interests
    Electronics, gliding, motorbikes

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  • Occupation
    helicopter pilot - retired
  • Boat Name
    Telemachus
  • Boat Location
    Fazeley Mill Marina, Tamworth

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  1. This post cannot be displayed because it is in a forum which requires at least 10 posts to view.
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  3. Oh yes that’s a very good point which I hadn’t thought of! I’m glad you said that because fitting an EV is on my list of things to do. 2.1bar/30 psi is the pump cut-out pressure. The accumulator should be set to just below cut in pressure, which is likely to be around 15-20psi. So around 15psi is about right for the accumulator, 30psi for the EV.
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  5. The accumulator should be set to a few psi below pump cut-in pressure. The EV should be set to pump cut-out pressure. There is no “right answer” for the size of the EV, the bigger it is, the less stress on the calorifier. But the downside of having a huge one is that after you heat the water and then turn on the hot tap for the first time, the flow out of the tap will all be from the EV until it’s empty, and that water is likely to be cold.
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  9. Different pressures. Oh yes, as per PeterF.
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  14. The only thing with relying on the cold water accumulator, is that when the pump cuts out, it is already mostly full. So when the calorifier heats up and water expands, there isn’t much room for the additional volume in the accumulator and so the pressure rises relatively easily/quickly. Whereas with an EV, it is still empty when the pump cuts out and only starts to fill when the water heats and expands. So even if an EV is a similar nominal volume to the accumulator, its effective volume is much greater.
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