Heliodyne Water Heaters

Heliodyne is a premium California-based solar thermal collector and system manufacturer. Founded 1976, in continuous operation through US solar thermal\'s ebbs and flows. The Heliodyne Gobi collector is widely regarded as among the highest-quality flat-plate solar thermal collectors available in the US market.

Solar thermal in 2026

Solar thermal (using sunlight directly to heat water) has been in decline against solar PV + heat pump water heater (using sunlight to make electricity that powers a heat pump). The math:

• Solar thermal — high efficiency converting sunlight to heat (50-70%), but only produces hot water (not flexible electricity)
• Solar PV + heat pump — lower direct efficiency (20-30%) but produces flexible electricity that runs heat pump water heater + EV + HVAC + house

For most US homes in 2026, solar PV + heat pump water heater is the better economic answer. Solar thermal still makes sense in specific scenarios:

1. High hot water demand (large family, pools, hot tubs) — solar thermal scales efficiently
2. Off-grid or limited grid scenarios — direct solar-to-water bypasses electrical complexity
3. Existing solar thermal system being replaced/upgraded (sunk-cost optimization)
4. State or utility incentives specifically for solar thermal
5. Hawaii (high electricity cost; specific Hawaii state programs for solar thermal)

The Heliodyne lineup

• Gobi Collectors — flat-plate solar thermal collectors. Gobi 410-001 (standard 4×8 ft), Gobi 410-002 (large 4×10 ft)
• Helio-Pak Complete Systems — collectors + storage tank + pump station + controller. Helio-Pak-80
• Components — pump stations, controllers. Stratos pump station

How solar thermal works

A complete solar thermal system has four parts:

1. Solar collector — rooftop or ground-mount flat-plate or evacuated-tube collector absorbs sunlight, heating a heat-transfer fluid (usually propylene glycol)
2. Pump station — circulates the heated fluid from collector to storage tank
3. Solar storage tank — single-coil or dual-coil tank with internal heat exchanger; transfers solar heat to domestic hot water
4. Backup water heater — gas or electric tank for cloudy days, evenings, high demand. Solar typically provides 60-80% of annual DHW

Federal and state incentives

• Federal solar Investment Tax Credit (ITC): 30% of installed cost (Section 25D residential)
• State rebates: Hawaii (best), California, Arizona, Oregon programs
• Utility rebates: Solar Renewable Energy Certificate (SREC) markets in some states

For typical residential install ($6,000-10,000), 30% federal + state stacking can net $3,000-6,000 after incentives.

Warranty

• Gobi collectors: 10 years
• Tanks: per tank manufacturer (typically 10 years)
• Pump station: 2 years

Bottom line

Heliodyne is the premium US solar thermal brand. Solar thermal is a smaller-market category than it was in 2010s — solar PV + heat pump usually wins on economics. For high-demand applications, off-grid, or state-incentive markets, Heliodyne Gobi remains the quality choice. Helio-Pak complete systems simplify install vs piecing components separately.