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  1. F

    Replacement UV cylinder

    As the kids are growing, I'm finding our 250L Megaflo is occasionally running out of HW. What are opinions on having a second UV cylinder vs having a bigger 400/500L cylinder fitted? Any pros and cons? My Megaflo is "only" 7 years old. Is there any resale value to these things, or do I just...
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    Boilermag isolation valve leaking

    I know the isolation valves supplied with magnetic filters can be poor quality and this one on my boilermag is leaking from the spindle. It only seems to happen first thing in the morning when there's a pool of water underneath it. It took some time to identify it as the source, as it doesn't...
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    Megaflo Air Bubble not taking expansion

    I noticed today that the pressure gauge on my incoming water supply was showing over 5 bar and creeping up fairly rapidly until it went past 6 (that's the max it goes to) and continued. The Megaflo pressure reducing valve should be 3 bar, and this is normally what the gauge shows. The only thing...
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    Vaillant S53 compared to other brands

    Hi All. For those who read my LLH thread, this question is because I'm weighing up whether my problems are just down to it being a Vaillant boiler. Quick background - I have 3 heating zones (u/s, d/s and hw). Any individual zone works fine. Multiple zones work fine when running together. The...
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    How does an accumulator work?

    Most of the literature on cold water accumulators such as the GAH Coldstream and TWS mains boost show a usable capacity of 50-60%. Is this volume usable in full? Is the initial draw off at the max pressure available (that the accumulator is pre-charged to) and then slowly decreases as the...
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    Upgrading pipe sizes

    So I'm about to have my hot and cold water pipes upgraded from 22mm poly to 28mm copper. This is to resolve the flow restriction to multiple shower outlets. There's approx 15m of pipe for each hot and cold leading to the bathrooms which will all be upgraded to 28mm. However, the megaflo inlet...
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    Unvented - how many showers/performance?

    I have a megaflo unvented cylinder which feeds 3 bathrooms. In particular, it feeds 3 showers which have pura thermostatic valves: http://www.purabathrooms.co.uk/catalog/index.php?route=product/product/datasheet&product_id=24158 The MI state the valve uses 32 litres/min at 3 bar. Two of my...
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    Hot water secondary return - plastic pipe?

    A quick question on secondary returns for HW. I remember reading somewhere that you cannot use Hep2o for a secondary return. Could someone explain why? I was thinking about this the other day, and central heating circuits are fine with Hep2o, so why not HW circuits? Surely both pump hot water...
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