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high gpm combi boilers? two units instead?
I've been planning to install a new boiler, and with some renovation, I can no longer vent anything to the roof. I had written off combi boilers because I will eventually have 5 bathrooms and 2 kitchens (mother-in-law suite), and I don't think a combi boiler would be able to keep up. so, the plan has been to go for a condensing boiler with indirect tank. however, I have been a little surprised at how expensive indirect tanks are. I can't for the life of me figure out why they're more expensive than a conventional water heater when they don't even have a burner. anyway, the high price tag of indirect tanks made me start looking back at combi boilers.
are there combi boilers that can handle 5 baths + 2 kitchens? I feel like it's reasonable to expect 3 or 4 simultaneous hot water draws, but that could be as much as 16GPM if 4 showers/tubs are going.
maybe the right answer is to use a combi boiler for 4 baths +1 kitchen, and buy a separate tankless for the mother-in-law suite? is 4 baths already more than a combi boiler can handle?