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Apollo heat system matched to water heater size?


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Anyone know how to tell if a water heater is adequately sized for an Apollo system and square footage? House is 1445' and the model number on the exchanger is 30 AHW 38. The gas water heater is 40 gals.

Reason I ask is the temp inside was about 55 degrees and I cut it up to 70. I also started the dishwasher around this time. 30 min later I checked the output at the registers and found 78 degrees. I shut the system off for 30 min, tried again and got about 100. The water temp at the sink was 115. Seems like the water tank size is too small since it could not keep up initially. Thanks!

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Sounds like the system was working ok. The problem is that the home was stone cold to begin with. It takes a while for forced hot air, via a hot water coil, to heat a home that is at 55 degrees. Also, you don't get a huge delta T from a hot water coil with 55º supply water. When you started the dishwasher it really put it behind the 8 ball.

If you took down some additional information like air handler cfm, piping size to hot water coil, dimensions and number of passes of the hot water coil and circ pump gpm you could give the manufacturer a call and explain the situation. They may be able to give you a design opinion.

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Apollo systems and other hydroponic heat type systems like the Apollo require a special water heater. The burner on this water heater produces more btu's, it is a beefed up unit with more insulation, etc. If a conventional water heater was hooked up to the system it will work but it will not work as well as it would with a matched water heater.

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