14 ensuite rooms, 3 x 300 litre unvented cylinder's, BOILERS ????

[hickings]

hi, I have been asked to finish a guest house which has 14 unsuite shower rooms. the old builders and plumbers have been kicked off for being too slow. the owner just wants it all finished now.
there is a 28mm hot feed, 22mm secondary return and a 22mm cold all already go to each room which I have pressure tested already. the incoming mans is a 50mm feed.
there will be just four radiators in communal areas.
all rooms will have air conditioning for heating/cooling.
they want 3x300 unvented cylinders which I will have no problem linking up.

PROBLEM
they want 2x 24kw Worcester Greenstar 24i System Boiler, with a low loss header.
i understand the owner wants two boilers linked together one for back up.

my issue is i think they are over kill for 3 cylinders and 4 rads

is there a better way to link the two boilers without using a low loss header and without multiply pumps as there is not much heat output needed. its not a cost thing.
i just wanted to here anyone else's suggestions?

 

[Killy Bing]

If they want it and are willing to pay, whats the problem?

what are the cylinders?

if they were oso super series each one would pack a 24kw coil!!

 

[TBServices]

14 bathrooms will deplete the cylinders in no time, so you ideally want the full KW allowance to aid fast recovery.

 

[Howsie]

28mm don't sound big enough to me but then again I'm full of morphine at the moment

 

[Roger Welton]

28mm deff doesn't sound big enough, and I'd be looking at Andrews type water heaters for such a large demand, 14 guests all getting up in the morning at roughly the same time put some load on the system.

 

[hickings]

I agree 28mm don't seem enough for me i am optimistic, I would of preferred to re design the whole layout but with plastered walls and already spending £350,000 on old builders he wants to make this work.
I was going to fit 3 x megaflo,
thanks for the reply, I suppose it would worth doing just for the fast recovery.

 

[Roger Welton]

2 x 24kW won't equal quick recovery on 3 x 300l Megaflows IIRC the coils can absorb 20+kW each

 

[hickings]

What would you fit Roger?????

 

[Roger Welton]

Andrews water heaters

Andrews Water Heaters and renewable heating solutions

They have a nice sizing app on the site somewhere

 

[IDCHAPPY]

28mm don't sound big enough to me but then again I'm full of morphine at the moment

Pass some here