Quality Pool Manufacturing


	Phone: 800.968.8878 Fax: 888.686.0880 5303 W. Vienna Road, Clio, MI 48420

Spa Heating Chart

Approximate time in minutes to raise a spa 10°F under average conditions.

Thermal Graph

Compares Heat Exchanger output at different heat source temperatures and flow rates.

Use these tables to determine how many Wilmark™ Quality Heat Exchangers to use for your application.

Number of heat exchangers required for your application / Indoor Pool / Outdoor Pool

Number of heat exchangers required for your application / Spa

These are general guidelines. Call us at 800.968.8878 or 810.670.2143 for sizing information for your specific application. Our table is based on a 25° temperature differential between the air and the water temperature. For example, the pool will maintain 80° if the air temperature does not go below 55°. Warmer climates and indoor pools do not require a 25° temperature differential.