On Dec 12, 8:19*am, "
wrote:

Do you have a pool? * Pool heater? *What size is the pool
and what is the pool heater in BTUs? * In my world, there
is no way this computes.

No way. An inground pool pump pumps in the vicinity of 40 gpm.

The HVAC line through that tiny heat exchanger seems it would have to
attain a temperature approaching 1000°F to make -any- difference.
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- gpsman