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    Heating works very slow recovery on DHW pipe design question

    whilst hot water OK recovery very slow poor flow took out cylinder and flushed OK, only pipe left was the connecting pipe from vent to cylinder - you can see connecting pipe in picture cut into and removed pipe hey presto it was totally blocked what was 22mm now had a 1 to 2mm hole in...
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    Heating works very slow recovery on DHW pipe design question

    Phew cracked it the system height (height from tank to F&E) is 7 metres, vent goose neck height was too small fitted a longer goose neck as per instructions from plumbing book and hey presto I now have Hot water, (I changed the filler washer in the F&E tank two weeks ago that was enough...
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    Heating works very slow recovery on DHW pipe design question

    chris R any comments on the PIC yes it is pumping over at the start and then settles back very little flow
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    Heating works very slow recovery on DHW pipe design question

    It does not have an injector T fitted also yes its a soft water area
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    Heating works very slow recovery on DHW pipe design question

    here is the pic of the cylcinder the 22 m pipe is the vent from the boiler the U bend is the cold feed from the F&E tank attached to the top of the cylinder coil inlet Ignore the cylinder stat its not connected the gate valve is open and free I had it apart last weekend thanks chris...
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    Heating works very slow recovery on DHW pipe design question

    Its a robust P kingfisher not green old but bomb proof, recently serviced, central heating hot and efficient re other post flow temp at the boiler hot, flow temp at the imlet to cylinder mostly hot, sometimes cold, hot flow then going up the vent and fill pipe!!! flow outlet from cylinder...
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    Heating works very slow recovery on DHW pipe design question

    yes must be approx 2.5m above tank
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    Heating works very slow recovery on DHW pipe design question

    I will try and find end point on this pipe Pump is new Grundfos 6m Feed tank has sufficient water The central heating has a zone valve the DHW circ is poor with this valve closed or open
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    Heating works very slow recovery on DHW pipe design question

    A U bend of 15mm pipe attached to the top of the top cylinder coil connection that goes north to the attic, Pump is at the boiler level
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    Heating works very slow recovery on DHW pipe design question

    Dave thanks for the quick reply the Cylinder is two floors up from the boiler (its in the cellar) The F&E tank is full, system is full of water your right, Air lock and/ or blockage looks to be the most likely chris
  11. C

    Heating works very slow recovery on DHW pipe design question

    Three story victorian house - Boiler OK recently serviced, central heating hot, no cylinder stat or valve, system is fully pumped DHW very very slow to recover Clearly flow from the boiler to cylinder is an issue, strangely is has 22mm entry into the HW cylinder heat exchanger but only...
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