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Thermostatic Control tankless water heaters Most Aquastar and Tagaki tankless heater units are
thermostatically controlled. At lower flow rates the gas flame is
automatically reduced to maintain a stable output temperature. The
temperature is front-panel adjustable from roughly 90°F to 140°F.
(We consider 120°F to be an optimal setting.) If the water flow rate
increases, the heater will respond by increasing the gas flow, up to
the heater's Btu maximum. This makes a heater that performs more
like the storage tank heaters we're all used to. The system isn't
perfect, the sudden opening of a second tap will still cause the
shower temperature to fluctuate. But this is also true of the
plumbing in most homes with storage tank heaters. With all the
tankless heater models we sell, we recommend only running a single
fixture, if that fixture is a shower. We're all touchy about our
shower temperature, and this is the best way to ensure a steady
temperature. The Aquastar units have built-in flow restrictors, so
that it is difficult to run more water through the unit than it can
heat. If too many taps are opened simultaneously, the water pressure
will fall and the water will simply run lukewarm, rather than
ice-cold. Check with the distributor to be sure this is correct when
buying a tankless water heater. |
