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Pros / Cons of Indirect Water Heater
I am looking into an oil-to-gas conversion in a relatively small 2 bath (1 full, 1 half) split level home on Long Island with baseboard heat. Currently we have a tankless boiler that heats our home just fine, but doesn't produce enough hot water to fill even half a bathtub with moderately warm water. Due to this, and the price of oil, I am interested in switching soon, before the available rebates are phased out.
Anyway, the contractors I have spoken to have all suggested that a smaller cast iron gas boiler is the best bet for my needs, considering how HE boilers (Burnham Alpine, for example) tend to require costly maintenance, and will not provide the efficiency they claim in my old single-zone baseboard system. At least this was my understanding. I am comfortable with going with the standard cast iron boiler (Burnham Series 2), assuming this information is correct. The cast iron unit is far cheaper, there is a substantial rebate, and I already have a new chimney liner, so utilizing a chimney-vented boiler would probably save me some cash in installation costs, too.
However, they have also discouraged an indirect water heater, but I am not sure why. These seem like solid products that would certainly provide added efficiency, unless I am missing something about how they work.
Is there a reason why an indirect wouldn't work for my home?
Thanks in advance for any help!