Units adopt 10 to 36 evacuated vacuum tubes or flat-panel solar collectors for efficient heat conversion. Water tanks can hold up to 500L.

165L tank capacity

Anhui Dongwei Group Corporation Ltd
Anhui Dongwei’s model φ58x1800-22/165L stainless steel solar water heater has a 165L tank. It uses evacuated vacuum tube collectors. The unit’s thermosiphon heats nonpressurized water while circulation is direct or open loop. The freestanding product requires direct-plug connection, and is priced between $220 and $275 for an MOQ of 10 sets. OEM orders are accepted.

Home-use unit resists 87psi

Changzhou Blueclean Solar Energy Co. Ltd
The model SHE470-58/1800-30 home-use active solar water heater from Changzhou Blueclean withstands a water pressure of 87psi or 6 bar. Fourteen 1mm copper heat pipes are built-in. The 30-tube version requires a surface heating area of 2.5sqm. MOQ for the product is 100 sets.

Adopts 1.5mm galvanized steel frame

Jiangsu Audary New Energy Co. Ltd
Jiangsu Audary’s ADL-CP-CC-20 model has a 1.5mm galvanized steel frame. Its inner tank is in 1.2mm-thick food-grade SUS 304-2B stainless steel while the outer tank is housed in 0.4mm galvanized steel. The tank can hold 100, 120, 140, 150, 160, 180, 240, 300 or 360L. Insulation is from 50 to 60mm PU foam. The model utilizes 10 to 36 58x1,800mm Al/N/Al-SS-CC evacuated glass vacuum tubes and a red copper heat-pipe header. It has 72-hour heat retention, 6 bar maximum working pressure and 25mm hail resistance. The product, priced between $240 and $600, comes with a magnesium rod, electrical heater and P/T valve. A 5-year warranty is given.

Stainless steel water tank

Jiangsu Obuy New Energy Development Co. Ltd
Priced at $100 to $600, the YJR-OB-897 model from Jiangsu Obuy features a standing stainless steel water tank with 60mm-thick insulation. Its solar panel collector is equipped with 18 vacuum tubes that convert solar radiation into thermal energy. Heat is transferred to the water by convective fluids in the copper heat-exchange section. The active split-type solar water heater can be connected with gas boilers and other heating devices using its upper copper coils. The cold water inlet is near the bottom while the hot water outlet is at the top.

Installs on sloped roofs

Jiaxing Jinchen Solar Tech Co. Ltd
Jiaxing Jinchen’s JXJC-NSW Active Solar Water Heater model has a triangle frame that stays stable even on sloped roofs. The nonpressurized unit adopts imported 0.4, 0.5, 0.6, 0.8 or 1mm-thick SUS304-2B food-grade stainless steel for the housing. Al/N/Al-SS-CC and selective sputter coating absorb up to 86 percent solar radiation. Evacuated glass vacuum tubes convert solar energy to heat while hot water circulates via an open loop system. The model’s inner tank, also in food grade SUS304-2B stainless steel, utilizes PU foam insulation to keep water hot for 72 hours. The high-vacuum closed cavity in-between the inner and outer tanks reduces heat emitted by convection and conduction. The electric heater, controller and assistant tank are optional. The product is priced between $80 and $300 per set.

Backup electrical heating system

Sinoyin Solares Co. Ltd
Sinoyin’s HSC-150L model operates using a flat-panel solar collector and an electrical heating system. The former is filled with deicing fluid that heats water while the heating system performs automatically the same function if maximum temperature required is not met. Circulation pumps start and shut-off automatically. The model’s solar collector can be installed on balconies or roofs, while its 100, 200, 250, 300, 400 or 500L water tank can be placed indoors or outdoors. The unit, with a 2-year warranty, is priced between $580 and $1,050.