Domestic hot water and space heating
I am trying to put together a system that can deliver domestic hot water and heat the house. The colonial house is in Brooklyn, NY ( zone 7), 29′ x 33′ and consists of 2 floors + basement. I am doing complete renovation and already removed all walls throughout the house and will use closed cell foam insulation in all walls and roof. I plan to run Pex in joists for both floors and I am thinking of using baseboard in the basement.
My questions are:
1. I read a lot on this website about issues with oversizing boilers, so I am trying to see if a boiler with around 8k-80k BTU/h will not short cycle , like for example HTP UFT-80W .
2. I found several companies online that design and pre-fabricate the whole domestic heat/water system, and in their quote I see they use Takagi T-H3-DV on-demand water heater, 15,000-199,000 BTU. Will this water heater short cycle in my scenario? Is it better to use a dedicated boiler instead?
thank you for any help