Provides 70% to 75% hot water for 4 to 5 people, it includes:

• 2-4x8 copper panels.
• 1 controller.
• 1 pump.
• All plumbing.
  

120 gallon

Provides 75% hot water for 6 or more people, it includes:

• 3-4x8 copper panels.
• 1 controller.
• 1 pump
• All plumbing.

Weather: Clear - 35000 BTU

Mildy Cloudy - 25000 BTU

Cloudy - 18000 BTU

Provides 60% to 70% hot water needed for 3 to 4 people.

For 4 to 5 people, use 2-4x8 panels instead of 1-4x10.