"TheScullster" wrote in message
...
Doctor Evil

Thanks for response but:

Property is 4 bed detached, not bungalow, hence 29kw boiler considered -
existing 50000btu model is struggling big style.
Tending away from combis due to pipe routing headaches and demand from 2
bathrooms SWMBO and teenage kids!

Any combi will do for heating purposes. The Alpha can do two shower no
problem. It will fill two bath simultaneously a bit slowly, but one bath
as fast as most cylinders. The recovery rate is minutes. Fill one bath
leave 5 mins and fill another. When the internal store is depleted it
reverts to normal combi flows.

I have a relative who fitted one on my advise when building an extension and
an extra bathroom. After 3 months they have had no problems with three
teenagers. They like the powerful power shower type mains showers. Fills
baths pronto and have never had to fill two baths together. If so, wait a
few minutes and it fills in a few minutes. It also heats the house up very
quickly compared to the old boiler they had

If you are going cylinder then get a quick recovery as you can downsize the
cylinder. This will reheat in minutes. Use two 2 port zone valves and have
the system a priority system with DHW priority. Instead of a power shower
pump have shower immersion coils. Two can be fitted in the cylinder as well
as a quick recovery coil.
http://www.rcmgroup.co.uk/mains_pres...ower/index.htm