You can't use a combi in a property with multiple bathrooms combis are for small houses and cannot run at 3 different flow temperatures at one time.
That's why I don't even consider the possibility and as a result I installed a continuous DWH heater, so heating and DHW are different systems.
My 30kw system boiler is basically like a big 300l storage combi, when the cylinder drops to a certain temperature the heating will go off all zone valves and zone pumps turn off and the boiler will go full pelt 70c flow temp until the cylinder is charged, which is usually only a few minutes.
I don't have a cylinder, it was too restrictive and inefficient so I replaced it with a continuous water heater producing water on demand at the temperature I decide.
If you need to find a tradesperson to get your job done, please try our local search below, or if you are doing it yourself you can find suppliers local to you.
Select the supplier or trade you require, enter your location to begin your search.
Are you a trade or supplier? You can create your listing free at DIYnot Local
