Indirect Unvented cylinder, Combi Boiler and Nest Thermostat

Discussion in 'Plumbers' Talk' started by Chris101, Apr 23, 2018.

  1. Chris101

    Chris101 Member

    We have just had an indirect unvented cylinder (250l Vertical Telford Tempest) installed along with a nest thermostat.
    The plumber was able to modify our existing combi boiler, so it runs like a system boiler.

    I am trying to understand how it works as currently the plumber has set it to come on for 2 hours each day (1hour between 5am-6am and 5pm-6pm).
    During these times, the boiler remains continuously on and only switches off after the hour mark.
    Is this right?
    I would have thought during the set times that the boiler should come on, it would work in connection with the cylinders thermostat so once the waters heat got to a set level, the boiler will shut off.

    The cylinders booklet states it takes 28min for it to heat up.

    Could someone please advise on how this setup should be working and if there is anything I could do to make it more efficient, then it currently is?

    Thank you
     

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