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baseboard, tankless, DMHW
Hi, I am new to the site and any response is appreciated.
I just finished closing in a 725 sq ft second floor addition with r38 in floor and ceiling.
It is an apartment with 2 small bedrooms, living room, kitchen and bath.
I was going to install forced air but the space is tight for duct work and furnace and I need domestic hot water also.
I am considering a gas tankless wall hung boiler for radiant or baseboard heat.
There is a possibility that large area rugs might be used so leaning more toward baseboard. With forced air I leave in the morning and therm set at 60 come home at 68, sleep 60. Wondering what recovery time is with baseboard in this addition?
I have seen 50k tankless boilers which probably would be all I need. I also see combi tankless with heat exchaner for heat and also dmhw. For my dmhw the combi is 190k and I am confused because that is much more than I need for the baseboard. Will the boiler cycle on and off frequently while feeding the baseboard because of the oversize of the boiler?
Will the boiler be able to operate at it's efficiency rating cycling so much?
I have seen 50 or 70k combi tankless but the dmhw is not enough.
Is there a way to have a seperate dmhw tank, heated by the combi tankless boiler that has a dmhw exchanger to increase the gpm's delivered? Is there a way to do it with the tankless boiler that doesn't come with a dmhw exchanger?
How can I figure what size tank I would need?
On the combi units they come with a circulating pump and expansion tank built in.
If I have 3 zones would I need to duplicate any of these?
My budget is tight so trying to figure the most cost effective way to go.
Any thoughts on this is greatly appreciated