Radiant Boiler & DHW, Help me pick my best option.
I live in a house built in 1957 in southern Wisconsin, 2400 sqft, Radiant in floor copper mixed with some baseboard radiant for areas of additions. 3BR 2.5 BA, Family of 3 (toddler under 1 included). The house is constructed of cinder block, with a insulation gap. LOTS of windows (most of which have been recently updated to new thermo-panes) and a flat roof. My current boiler is a Weil-McLain cast iron which dates nearly 30 years. I've got a standard natural gas water heater for DHW, and a old electric heater that is not being used and is to be removed. My plumbing is a disaster because of what looks like years of patches and bad plumbing. I dont have any heat loss numbers yet (Contractor #4 ran them i just don't have them yet).The Update:
I'm hoping to update to something that can increase efficiency as well as save space. Updating all plumbing and making it as clean and out of the way as possible. For this reason I've been requesting bids for wall mount units with a DHW ability. Still natural gas fired.
Zones, pumps, and thermostats, and other details aside I'm having a hard time determining my best option. This is especially true for brand reliability, maintenance costs, and indirect vs combi units.The Options
I've received 3 bids, and I'm waiting on the 4th to come in (its been more than a month and I'm thinking i should just pass on that contractor at this point). Below are my options.
Option 1: Weil McLain 97+ 110 with a 45 gallon indirect tank.
Option 2: HTP Elite FT 110 with 60 gallon Indirect tank
Option 3: IBC Combi Boiler DC33-160. 4GPM DHW delivery
Option 4: This bid has yet to come in, but the contractor works with Viessman 200 or maybe 220, and we had discussed a indirect tank and a modulating pump ( i think that is what it's called?)I've done some reading about combi units vs an indirect tank, and although the appeal of the combi is enticing, I'm worried about longer term reliability with a unit like this. Ideally I'm looking long term and high quality. Should i be looking at a single modulating pump, or a single pump for each zone?
Can anyone help me?
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