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Passive Solar Water Heater - Sizing
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Quick Sizing
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Size varies widely with lifestyle (from 10 to 30 gallons or more per person) and with season (most people take longer and hotter showers in the winter). For situations involving small families in 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 most likely be inadequate for a family of five living in the same house tomorrow.
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Family Size
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PT20
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PT30
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PT40
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PT50
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PT60
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PT80
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1-2
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3
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4
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5
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6+
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Detailed Sizing
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First estimate your hot water demand in gallons per day; use the chart below for an average figure (Note: add 15 gallons per additional person or 20 gallons per additional room). It varies widely with lifestyle (from 10 to 30 gallons or more per person) and with season (most people take longer and hotter showers in the winter).
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People
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Gallons
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Bedrooms
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Gallons
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1
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20
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1
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30
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2
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40
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2
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50
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3
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55
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3
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70
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4
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70
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4
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90
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5
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85
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5
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110
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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.
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Model
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PT20 |
PT30 |
PT40 |
PT50 |
PT60 |
PT80 |
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Av. output (gal)
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40 |
60 |
80 |
100 |
120 |
160 |
For additional information, please contact Customer Service.
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