Overview
System type: Indirect, unpressurized drainback solar hot water
Location: Monument, Colorado
Solar resource: 5.48 average daily peak sun-hours
Production: Rated 2,836 kBtu per month (average)
Climate: SRCC Category D, Cool Climate
Percentage of hot water produced annually: 100%
Equipment
Collectors: Three SunEarth, EC-40, 40.9 ft.2
Collector installation: Roof-mounted with 190° orientation; 39.8° tilt
Heat-transfer fluid: Distilled water
Drainback tank: Solar Hot S-T-15SSDB, 15 gal.
Circulation pump: Taco 008-SF6
Pump controller: Caleffi iSolar Plus
Storage
Tank: Vaughn, S120SRW202TB45, 120 gal., dual heat exchanger
Heat exchangers: Two Vaughn copper, removable, submerged finned exchangers
Backup DHW: 4,500 W heating element in solar storage tank
System Performance Metering
Thermometer: Four Winters T174-SW, plus two thermocouple connections to Caleffi controller
Flow meter: Blue-White Industries, F-450
System Cost
Initial Cost: $12,440
Less Incentives, Rebates & Tax Credits: $3,732 (federal tax credit); $3,000 (“Recharge Colorado” rebate)
Final installed cost: $5,708
