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Non-pressure solar water geysers always work with an assistant tank for automatic water refill into main storage tank. The working theory is similar with flush lavatory, with a float ball valve inside assistant tank to control water filling, the assistant tank is usually installed on top of main solar water heater tank, with a stainless pipe connecting each other, when float ball descends, the valve connecting with float ball opens to let in city water, when main tank is full and water rise in assistant tank, the float ball rises to shut the valve and water refill stops. Assistant Tank For Solar Water Geyser is specially designed for non-pressure solar water heaters, it works mechanically without manual operation, avoiding water overflow when manual water refilling. With an assistant tank the solar water heater is always full of water.

Solar geysers are always working with an electric heater to assist with water heating, especially when it's raining or overcast.

Solar evacuated tubes with heat pipes are the most efficient solar hot water heaters on the market. Heat pipe technology and vacuum tubes are not new, in fact the International Space Station use both these technologies. Most laptops use heat pipes internally to cool the mother board, and vacuum tubes have been used in electronics such as TV and radios. In fact vacuum tubes are still the choice for high end amplifiers.

• Hailstone Resistance: up to φmm (1"), Max Operating Pressure: 87psi, Max Flow Rate: 5.25 gpm
• 14mm TU1 Copper Heat Pipes, Manifold insulation: 45mm 93 Kg/m^3 Rockwool, Rated Best Heat Retention
• φ58mm x 1800mm Three-Target Cu/SS-ALN(H)/SS-ALN(L)/ALN Vacuum Tubes, High Boron Silicon 3.3 Glass
• Sun Absorption Efficiency: 93-96%, Vacuum Rating: Less than 5.0 x 10^3 Pa, Lifespan:70% @ 15 Years
• OG-100 SRCC Certificate Number: 10001880, Eligible for 30% Federal Tax Rebate, Winter Resistant

The Gravity Solar Geyser 150L has been manufactured to suit African conditions, with seals thermal tested to Africa’s high temperatures. The geysers with optional magnesium rods to reduce the effects of most corrosive waters as well as electrolytic corrosion. The main features of these water heaters are:

• Evacuated tube water heating system reaching around 90 degrees on a good clear summer day.
• Insulated stainless steel inner tank and thermal protective outer tank
• Standard header tank for pressure and water level control
• All units supplied with stand and roof bracket
• A back up electricity element can be installed on the geyser for emergencies, or when water use is higher than usual( the element is a separate purchase)

The Gravity Solar Geyser 100L has been manufactured to suit African conditions, with seals thermal tested to Africa’s high temperatures. The geysers with optional magnesium rods to reduce the effects of most corrosive waters as well as electrolytic corrosion. The main features of these water heaters are:

• Evacuated tube water heating system reaching around 90 degrees on a good clear summer day.
• Insulated stainless steel inner tank and thermal protective outer tank
• Standard header tank for pressure and water level control
• All units supplied with stand and roof bracket
• A back up electricity element can be installed on the geyser for emergencies, or when water use is higher than usual( the element is a separate purchase)

• Digital readout helps manage oil changes and maintenance schedule
• Features electric start, low-oil shutdown, an automatic voltage regulator and overload protection to maximize safety
• CARB and EPA III meet requirements for sale in all 50 states
• Includes wheel kit and foldable handles for easy transport
• 223cc engine provides 4,750 surge watt and 3,750 rated watt