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Domestic Hot Water Energy Consumption at 30 gal/pers per day:

DHW E [Btu] = Wflo [gal/d] * 8.3454 * c_p * (T_hot - T_cold)

Wflo = 90 gal/d for 3 persons = 3 * 30 gal/pers per day
c_p = 1 Btu / lb / F
T_hot = 110 F
T_cold = 52 F
Density of H20 = 8.3454 lb/gal

Therefore;
Thermal DHW consumption DHW E = 43,500 Btu per day.

Ideally that would be the amount of Solar Energy that we would like to collect.


SunEarth Empire Collectors (EC32) can collect -> 700 Btu / ft² / d in a cool climate.

Sun Earth Empire Series Specs

Since one collector panel has 30 ft² of net area, it follows that 21,000 Btu / panel / day can be collected on a clear day, because:

700 Btu / ft² / d * 30 ft² = 21,000 Btu/d.

And with 2 panels of 30 ft² each, the amount collected is 42,000 Btu/day on a clear day. This is 97% of the DWHE of 43,500 Btu, the DHW energy consumed by 3 people (see above).

Cost of EASET's 2 Panel Thermal Solar System:

Solar Panels				$2,232.00
Tank					$1,820.00
Balance of Systems: 
(racks, air valves, pumps, controls)		$1,324.00
Labor					$3,000.00
Shipping				   	     $50.00
Additional Costs			  	   $600.00
TOTAL INSTALLED PRICE			$9,026.00

Federal Tax Credit				$2,000.00  	30% Federal Tax Credit , max $2,000

NYS Tax Credit  NY Tax Credit		$1,756.50	NY Tax Credit 25%, max $5,000

Total Cost 				$5,269.50