Maybe it’s a guy thing, but there’s something macho about the Phoenix Evolution self-contained hydronic heating system. It looks like the tank might open at any moment as a miniature Darth Vader steps out. This black beauty is a super-efficient boiler attached directly to a water tank, but with lots of other bells and whistles. For example, it can integrate a solar heating loop to supplement the gas heat. And the 55-gallon tank is super insulated, losing just a half degree per hour. But the boiler is a whole-house heating system, plus a water heater—producing up to 314 gallons of hot water in an hour at 96% efficiency. The 135,000 BTU boiler can supply baseboard heat at the same efficiency.
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