Recently I received a number of questions, like the following one, from readers about sizing lindirect water heaters: I am considering an indirect and looking at the Triangle Tube Smart 50 or 40. The boiler I am considering is also Triangle Tube Prestige 110 at 110,000 Btuh. The next size, Prestige, is 160,000 Btuh or more. The Triangle Tube Smart 50 has boiler output Btuh listed at 140,000. The Smart 40 has boiler output listed at 112,000 Btuh. Should the boiler I select be capable of, or close to, the output listed for the indirect?rnThe Triangle Tube indirect water heater has a very low head-loss, which means the contractor can utilize one of a number of low wattage circulators now available, which saves on parasitic electricity costs. That has the potential to translate into $21.60 saved each year, and can add up to $1,435 given the projectedrn30-year life-span for a stainless-steel indirect and the historical 5% increase in electrical cost.
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