People	Gallons	Bedrooms	Gallons
1	20	1	30
2	40	2	50
3	55	3	70
4	70	4	90
5	85	5	110

For situations involving small families in a large house, the number of bedrooms should be considered in sizing a solar water heater. A system sized to meet the needs of two people in a five bedroom house today will likely be inadequate for a family of five living in the same house tomorrow.

Next, choose a system from the following chart based on the gallons required. Note that multiple units may be combined to achieve the total gallons desired. It is generally wise to slightly oversize the system to help reduce backup requirements.

Model	PT20	PT30	PT40	PT50	PT60	PT80
Av. output (gal)	40	60	80	100	120	160

For additional information, please contact Customer Service.