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Indirect size w/ smallish boiler.
My new build has two bathrooms w/ showers. No bathtubs. Just the two of us -- with occasional guests. The Viessmann B2HA -19 boiler is rated at 67k . Guess I could step up from the 42g to the 50g (52?) Viessmann indirect. They have a new 42g -- but, I think it's just the color that's "new" . Thoughts? This house is in PA with a well.
Our studio in the city has a typical 40g gas Bradford White ... think it's just a 26k burner and I never have an issue. Granted -- just one bathroom. My other houses have larger boilers .. the smallest being an 80% 115BTU cast iron coupled to a Buderus indirect .... I do keep it at 140. Again .. never an issue. City water.
It's hard to figure out the recovery as they all list larger boiler sizes. the larger tank will give a bit more reserve .. but, the recovery will be longer. Viessmann sells a boiler w/ 26g tank with what looks like the same output ... expensive product.