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As the Glow Worm boilers have much larger HW storage than the 937, doesn't this mean that they are more capable of supplying large amounts of HW?

It's almost impossible to compare the stats from the websites. The Vaillant offers 15.2 l/m @ 65°, the Alpha offers 18 l/m @ 55°. Which is better? I presume this is the blended flow rate, so what's the flow rate when the storage is depleted? The Alpha has 52 litres HW storage whereas the...

Which Storage combi-boiler performs best (flow rate, duration, ETC) I've narrowed it down to these 2 (but still open to suggestions). I need a combi because I have no space for a HW cylinder but I need enough HW for a 4 bed house with 2 bathrooms. does anyone have experience with either (or...

Do you have any suggestions?

The showers aren't installed yet. I'm guessing an average shower will run at 10 l/m for and average of 10 minutes. So that's 100 l per shower. So would a 300l accumulator be suitable? The current HW cylinder is in a bedroom and needs to be removed. Currently it does not deliver enough pressure...

Thanks for your advice regarding the accumulator. Maybe you could advise me on which combi boiler to get. All as I need is enough pressure for two showers running simultaneously. Maybe a powerful combi (Mikrofill Ethos 54c) or a storage combi (WB Greenstar Highflow 440 CDi or Vaillant...

Thanks, Simon. Do you have any experience/knowledge of Altecnic accumulators? www.altecnic.co.uk They seem to be quite a bit cheaper. I will double check the pressure, but I'm sure when the plumber turned off the tap, the pressure gauge was showing 7-8 bar.

I noticed you suggested a DualStream on another thread, would this be an option for me? Would the DualStream fit in the attic - which isn't reinforced? I'm based in North Ealing - could you visit us and give us an estimate? btw. I think the 4bar pressure is dynamic pressure - not static.

Thanks for the reply, simond. Could I simply replace my current CWS tank in the attic with an accumulator? How do I calculate the size of the accumulator required? The current CWS tank is 60x50x120 (cm) which is approx 270 litres if 3/4 full. Would the accumulator supply water to the...

I'm another unlucky one living in London unable to get decent pressure and flow rate from an old lead pipe water main. I'm getting 12 l/m at 4 bar - which isn't enough to supply anything other than a gravity HW system. Thames water told me it could cost £3k just for them to install the...