Anyone knows what would be appropriate combi boiler configuration (type/model/number of units) to provide heat for 3000 sq ft home? I am planning to have one zone for the first floor, one zone for basement and 4 zones (one for each room) on second floor.Thanks.
You will really need an onsite visit with an installer for this one as there are too many variables to start guessing on here. One of those would be how many points of use are there for hot water and how many people will be using them at any one time.
Your best bet would to sit down with an installer. You can have as many boilers you want to heat your house, but would it be cost effective. You can split the upstairs with the downstairs. (basement, first floor) on one boiler, and second floor on the other. I've been in the heating Business for 32 yrs, and only seen a few houses with two boilers. Personally, I would just go with one boiler, and zone off the rooms/levels.
