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Nital101 03-04-2012 02:51 PM

Aquastat/Thermostat DHW question.
My mom moved into a new house last year which had a different DHW setup than she was used to. Before, she had an oil fired boiler for heating and a separate electric water heater. The new house has an oil fired boiler with an integrated DHW coil. She complained that the water was too hot and that she didnt like the boiler running all year long(even ran out of oil because she didnt think of it in the summer) and was considering installing an electric water heater. I figured that was not the smartest or most economical plan, and that easier things could be done, like using anti-scald valves, a mixing valve at the boiler, or just getting used to adjusting the water temp at the fixture more carefully(I never had a problem with DHW coils in the places I lived), but she and my brother-in-law went ahead and installed one anyway. She said she was happy with it and that now she could shut the boiler off during the summer months and save fuel.

My question is first, what the best option would have been for that complaint from an outside perspective and if killing the boiler for several months is a bad practice.

My other question was if it would be a recommeded practice to wire the aquastat and thermostat in series to eliminate having to manually turn the boiler off when there will be no calls for heating. It's just one zone, so wiring the devices in series will only turn the boiler on when there's a call for heating and it will cycle on and off then based on the aquastat. Is this a bad idea?

beenthere 03-04-2012 03:50 PM

Electric water heater was the best option.

Aquastat can be wired to bypass the low limit function.

Nital101 03-04-2012 05:55 PM


Originally Posted by beenthere (Post 870260)
Aquastat can be wired to bypass the low limit function.

By that you mean...exactly what I described? or something different?

beenthere 03-04-2012 06:44 PM

Only a wire change in the aquastat, nothing with the thermostat wiring.

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