16 Tube 150L Direct System – Retrofit – Frost & Frost Free
This particular direct system is used in both frost and frost free locations and where the water quality is good (less than 600ppm Total Dissolved Solids/Minerals).
The solar retrofit conversion system is specifically designed to convert an existing installed Kwikot or any other make or brand of high pressure electric water heater with a working pressure of 400kPa or 600kPa with a storage capacity of 150lts and 200lts, into a direct solar water heating system.
The system is suitable for all climatic conditions (frost and frost free locations) and works on the pump circulation method with an array of evacuated tubes.
Solar Retrofit Components
The first thing that have to be determined is the working pressure i.e. 400kPa or 600kPa of the existing electric water heater that is to be converted to a solar water heater as this will determine which installation component kit is required.
Component kit consist of the following:
16 x Evacuated Tube Manifold and Frame for 150L Electrical Geyser
Combination Safety Valve 400kPa or 600kPa
Combination Drain Cock
Auto Air Release Valve 150degC
Non Return Valve
12V Solar Circulation Pump
12V 10W Solar Panel
2 x 15mm Gate Valves
20A Digital DB Timer
4 x 15mm Pipe Insulation
The vacuum tube system is used as the solar collector, due to the systems resistance against freezing with silicone inserts inserted into the exposed copper pipe work on the roof, which is installed on either ends of the vacuum tube manifold. The pipework must be lagged Thermal Pipe Lagging. It is recommended that all pipe work within the interior of the roof is lagged as well, in order to reduce heat loss.
A 12V solar circulation pump installed in the inside of the roof and on the cold water supply from the electric water heater. The 12V pump is powered by a 10W solar panel which is installed on the exterior of the roof.
