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  1. M

    Baxi Duo Tec 40 HE A Fluctuating Hot Water Temperature

    I can say the boiler did once work correctly with the low flow fittings as when talking a shower it is most obvious due to the constantly fluctuating temperature which we never had before. Only modifications since the boiler was fitted is we have had an extension which added four radiators the...
  2. M

    Baxi Duo Tec 40 HE A Fluctuating Hot Water Temperature

    I don't follow you, I understand that these thermostatic valves have non return valves in them but the one I changed had most certainly failed. If I understand correctly any thermostatic valve has to have a cold & hot water supply to regulate the water temp which intern gives the possibility of...
  3. M

    Baxi Duo Tec 40 HE A Fluctuating Hot Water Temperature

    Funny you mention that in the past I have had the thermostatic valve for the bath tap passing cold mains water to the hot side. Found this by switching the cold water mains supply tap off under the boiler & turned a hot tap on. Water was still coming out the tap at a rapid rate which was...
  4. M

    Baxi Duo Tec 40 HE A Fluctuating Hot Water Temperature

    Yes all the taps have the braided hoses on the taps so I guess this is where the low flow rate is coming from. I have not checked the strainer in the main water supply tap under the boiler or the one that is part of the restrictor in the hydraulic inlet assembly but I would have thought if...
  5. M

    Baxi Duo Tec 40 HE A Fluctuating Hot Water Temperature

    I am running the DHW at 43 °C because I find if it is set higher the water is far to hot at the taps & can scald you. Also why heat the water to a higher temperature than necessary? Seems like a waste of gas to me & 60 °C at the tap is way to hot. I have tried the setting the domestic hot water...
  6. M

    Baxi Duo Tec 40 HE A Fluctuating Hot Water Temperature

    Hello All, I am currently having an issue with my Baxi Duo Tec 40 HE A not maintaining a constant temperature for the domestic hot water. With a thermometer under a tap & the domestic hot water thermostat set to 43 °C I get a fluctuating temperature from 51 °C to 38 °C which is clearly not...
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