Combi with a 300 litre hot water tank

MJPD29 · Sep 21, 2017

Sure the combi heats the water as required and the stat doesn't need to call for it? Unless I am missing something

Wilko · Sep 21, 2017

It will depend on the HW flow rate of the combi they've picked. A good one will run a shower fine, but maybe not 2 or 3. Could try restrictors on the showers to get over this I guess (?).

Leesparkykent · Sep 21, 2017

combi boilers, imo are useless with more than 1 shower.

David M · Sep 22, 2017

Wilko said:
It will depend on the HW flow rate of the combi they've picked. A good one will run a shower fine, but maybe not 2 or 3. Could try restrictors on the showers to get over this I guess (?).

Won't make much difference, you just can't get the volume of water required because of the way instant hot water systems work.

David M · Sep 22, 2017

Wilko said:
Using a combi to run multiple showers is not going to work for the tenants, I would have thought.

Correct, you wouldn't spec a combi boiler for multiple showers that are likely to be used simultaneously. A pressurized system boiler with suitably sized hot water storage tank is going to be more cost effective and better for the job.