The direct system is used in frost-free locations, where the ambient temperature never falls below 5 degree Celsius and where the water quality is good (less than 600ppm Total Dissolved Solids/Minerals).
A direct system is where the water to be used in the household (hot water) circulates through the solar collector panels, or solar vacuum tubes manifold, transferring solar energy into the storage tank of the solar water heater.
The direct system can be installed a a Split System (pumped or thermosyphoned circulation methods), where the solar water heater is installed inside the roof or away from the solar collector panels or solar vacuum tubes, or installed as a Close Coupled System (thermosyphon circulation), where the solar water heater is installed outside on the roof and above or higher than the solar collector panels or solar vacuum tubes (see section Circulation Methods).
The Kwikot Kwiksol Solar Water Heater Direct System complies with SANS 1307, is SABS 400kPa approved and can be used as a close coupled system or split system.
The inner cylinder is manufactured from 2mm steel and thermo fused porcelain enamelled for cylinder longevity and hygeine.
Polyurethane insulation between the inner cylinder and outer casement reduces energy and heat loss.
2 x magnesium sacrificial anodes are fitted for corrosion protection.
The solar water heater is designed for domestic hot water application in conjunction with one or more solar collector panels or solar vacuum tubes.
The two extra water connections required for connecting solar collector panels or connecting the manifold above the solar vacuum tubes, and the booster element, ensures that the solar water heater can be used as a conventional electric water heater and as a solar water heater.
The solar water heater thermostat will automatically switch on when the incoming hot water from the solar collector panels or from the manifold above the solar vacuum tubes, has not reached the set temperature setting on the thermostat. This will occur on cloudy days and at night when the water temperature drops in the solar water heater or when hot water is drawn off and cold water enters the solar water heater.
When the solar water heater is installed in the roof, it must be installed in compliance with SANS 10106 Solar Water Heater Specification complete with a Temperature & Pressure Valve (Safety Valve), Drain Cock (both supplied with the solar water heater), Multi Pressure Control Valve 400kPa, Drip Tray and Kwikot Vacuum Breakers on the cold water supply and hot water supply.
If the solar water heater is installed in the roof, the following minimum installation clearance must be allowed for on each side of the solar water heater in order to remove the element or thermostat and the anode/s from the opposite end:
If the solar water heater is installed on the roof, careful inspection must be carried out to ensure that the roof can support the weight of the entire installation system once it is filled with water. Care must be taken where the front feet of the solar water heater are located. The feet should be located over a tile batten, purlin or similar for maximum strength.