20LPM, 5 bar pressure, combi or unvented cylinder?

[kundera]

Hello,

I'm about to get quotes on a new central heating and hot water installation in my house which we are modernising.

I have black mdpe supplying the house - achieving 20 litres per minute with a pressure of 5 bar. (As measured by the water board). It would be possible to upgrade, but I'd rather avoid this unless I really have to.

The system needs to supply two bathrooms, both with showers, and a kitchen.

The architect suggested we install a megaflo unvented cylinder, however my flow appears to be on the cusp of what is acceptable for the system. I then thought that my best bet would be a worcester highflow combi. However, after speaking to two engineers I've had conflicting advice on which way to go.

Any advice / experience would be really appreciated.

 

[ljrgas]

unvented!

 

[RickyLee53]

I'm not a professional, but have been looking at the exact same myself. I was going unvented. I have 3.6 bar pressure but 30lpm. So it was a little easier.

Somebody (on here) suggested to go with a Glow Worm Ultrapower.

It seems a good compromise between the 2. I decided with my flow rate it's probably not upto the job, but it'd be perfect for yours.

http://www.plumbnation.co.uk/site/glow-worm-ultrapower-170sxi-system-store-boiler-natural-lpg-gas/

 

[kundera]

Thanks for that! Just having a look now at the ultraflow.