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From responses so far, it looks like my current flow of 20l/min may not be sufficient for an unvented system to supply 5 showers (not all on at the same time). The current system is a vented hot water cylinder, with a pump to boost water to showers. Cold feed is currently provided by tanks in...

Would this work? (to increase mains pressure going into unvented cylinder)

Tony - thanks for replying. Understood about measuring pressure - will have to do that next. Is there a preference for Direct vs Indirect heating methods? Would you be interested in quoting for this work? you contact me on Thanks MOD please see 14a

Hi Guys, Have a few questions on unvented cylinders: - I have a flow rate of at least 20 litres per min on Ground level (worst case scenario based on my calculations). Is that enough to provide at least 2 showers at the same time on the 2nd floor? (approx 8m higher from ground) - Direct...

htgeng, ChrisR - this is exactly the type of system i'm looking for. I forgot to mention that we have an ol coal vault at basement level, which is located just outside the property (under the pavement) that could be used to house everything. I understand that it's a complex system to design, but...

Thanks for your responses. I have enquired about getting an upgraded Water Line into the property but have been told it would be very difficult and costly due to the location of the property (on a busy main street). If I were to go for a megaflow system, and assuming my mains water pressure...

Would like your advice on our situation: We live in a townhouse which currently has 3 floors, soon to be 4 with a new loft extension (ground + 3) that is planned. The plumbing system we currently have is as follows. - Boiler in kitchen (on ground floor) - Cold Tank in current loft - Hot...