Products and Services

We provide the most advanced evacuated-tube solar collectors certified by SRCC:

Our OEM supplier is Sunrain, which is the world's largest exporter of solar collectors, and was recently awarded the highest international quality award - "International Quality Star” issued by the Business Initiative Directions in Geneva, Switzerland, joining the rank of GE, Coca-Cola and other world renowned companies in winning this award. See more details at www.solartubs.com/Solar-Evacuated-Tube.html 

Detailed Product Specifications of the 20-evacuated tube heat pipe collector TZ58/1800-20R, SRCC certified:

Heat Loss: (a1): 1.529W/m2 K (.269 (Btu/h)/ft2/F)
Heat Loss: (a2): 0.0166W/m2 K2 (.003 (Btu/h)/ft2/F)
Stagnation Temp: 200.3 C (392F)
Volume of Water In Header: 0.188 Gallons (.71L)
Pressure Drop Per collector: 1.5 PSI
Recommended Flow: 1-1.5GPM
Aperture Area: 1.720 m x 0.0544 m x (# of tubes )= 1.871 (for 20 tube)
Absorber Area: 1.720 m x 0.0470 x (#of tubes) = 1.6168 (for 20 tube)
Distance Between Tubes 7.8cm or 3"
Insulation In Header: polyurethane and mineral wool
Header Material: Aluminum
Fluid Operating Pressure:: 87 psi
Maximum Service Temperature: 95C (203F)
Length (nominal): 1800mm (70")
Outer tube diameter : 58mm (2.2")
Inner tube diameter: 47mm (2.1")
Glass thickness: 1.6mm (0.1")
Thermal expansion: 3.3x10-6 oC
Material: Borosilicate Glass 3.3
Absorptive Coating: Cu/AL/SS/N2
Transmission Through Glass: >92% (AM1.5)
Absorptivity Coefficient: > 94%
Emittance: < 7%
Vacuum: P<5x10-4 Pa
BTU Output Per Day (standard) 28,000 BTU
Manifold connection: 1" male threaded
Unit Dimensions: 5.7ft W x 6.7ft H
Average Efficiency: 71%
Warranty 10 Years
Estimated Lifespan 25-30 Years
Weight (tubes with frame): 174 lbs



Sloped or flat roof (or ground) mounting hardware is include.

30-tube heat pipe collector TZ58/1800-30R, SRCC certified.

Similar specifications as above, but 10 more tubes, 42,000BTU/day.

Sloped or flat roof (or ground) mounting hardware is include.

We highly recommend PV controlled solar heating systems and avoid using controllers, sensors, and thermostats etc because the latter components are the most troublesome parts in the otherwise highly reliable solar heating systems (controller electronics can be easily damaged by spikes in power supply or lightening; sensors and thermostats also frequently malfunction). A PV controlling a PV pump is extremely reliable. It will work perfectly even when there is a power outage during bad weather, or when circuit breaker is tripped, residents turn off power etc. Any power outage can potentially cause damage to controller-sensors controlled systems.

We can provide 12V, 15W PV panel with mounting hardware, El SID PV pump (10W), check valve, pressure relieve valve, glycol charging inlet and outlet valves, pressure gauge, and fittings as depicted in the following pictures for $390. We can also provide the highly reliable thermosiphon heat exchanger for $119 (saving you another pump and potential problems).

EL SID stands for extremely lasting static-impeller driven. The magnetic field drives the impeller and spins it without any moving parts or seals. They are completely brass and stainless steel and will not corrode. They have no seals (leak proof), no brush or bearings to wear off and will not get hot, run very quiet, can stand 250°F temperature fluid and 175 PSI pressure and have extremely long life (several times longer life span than other pumps). They are highly reliable and maintenance free. They start at 1 watt, run faster when sunshine is stronger, and can move up to 6 gallons of fluid per minute (far exceeding the requirement of a typical closed-loop solar heating system. A closed-loop pressurized system has no water head to overcome). All these superior features make them the best choice and value for a reliable solar heating system.

For comparison of evacuated tubes vs. flat plates in design etc, see www.SolarPlusGreen.com/tube-vs-plate.htm

Our systems are very modular and can be easily expanded by connecting more solar collectors and adding one or more water tanks, with lower cost per unit of hot water as system size increases.

Contact us for your particular needs, whether it is commercial or residential, plumbers getting into this rapidly expanding new field, or do-it-yourself projects. You will be happy about your investment return and the great satisfaction in going solar.

SolarPlusGreen LLC, 1104 Hendersonville Rd, Asheville, NC 28803; see location map.
Ph: 828-301-2021, Fax: 828-277-1240; office@SolarPlusGreen.com