Help Please Combi Confusion

[DIYdaddie]

I am having work done on the house and am keen to ensure the heating system is future proof and I choose the right boiler.

Current Set-up

Large 5 bed period drafty House, 1 bathroom, Poor Performing Potterton 80 Suprimma (cuts out, doesn't heat all the rads), Hot Water Cylinder, Storage Tank, Low Pressure due to location and no pump.

New Set-up

We are binning the bath and focusing on a nice shower only, this will have a 10in plus rose and I want high high pressure.

I have 3.5 Bar from the mains.

The question is

If i put 3.5 bar in to a Combi will I get 3.5 bar out (i understand the pipe work to the shower will reduce this abit)?

I will be building another shower/bath in 5 years time so I would want the boiler to be able to support another shower and/or bath.

We do not want massive changes in pressure and temp when someone uses the kitchen tap for example.

Can a Combi do all this? If so which one?

Flow rates I have been looking at 38kw / 15.6 Litres Per Min and above.

Please help me, i am confused by various people saying big Combi's can do this or No only storage tank would work?

Many thanks for reading this.

B

 

[tonybhoy]

Better off with an unvented cylinder and a system boiler ,IMO.

There are Combi boilers that will deliver up to 25 litres per minute,

http://www.ethosboilers.co.uk/products_54c.php

but you are into unknown territory with these and technical stuff with the gas supply and or meter having to be upgraded.

Most Combi boilers will struggle with a ten inch shower rose you really do need a pump/unvented set up with that.

 

[DIYdaddie]

Many thanks for your response,

Thats what I feared.

Is that the general consensus on the forum?

Thanks

B