Model energy by season and temperature, then compare optional-fee recovery with guest behavior and operational complexity.
What to verify before buying
Fuel or electric bills, heater type and efficiency, pool volume, local weather, fee collections, refund disputes, and maintenance history.
How to make the decision
Calculate net heating contribution by month: fees collected minus energy, wear, and support. Test a case where guests decline the fee but the pool still needs baseline service.
Compare heated guest-days with warm-up energy and standby service. If fees are optional, the forecast needs a realistic take-up assumption rather than universal participation.
Purchase scenario
A hypothetical $60-per-heated-day fee earns $1,200 from 20 paid heating days. If guest heating, warm-up energy and additional service cost $1,450, heating contribution is negative $250 before replacement reserves. Counting ten stays without their heated-day count would not establish revenue.
The underwriting mistake to avoid
Assuming every winter booking buys heat or marketing a usable pool when the operating policy makes it impractical.
Numerical scenarios are illustrative, not property forecasts. Use address-specific records and written terms before committing capital.