KJM Renewables Ltd in conjunction with Imagination Solar  have designed into our systems a Drain back facility. This simply means that once the hot water is at 80C or there is no sunlight to heat the system, the pump ceases to circulate water through the system. When this happens the water in the system automatically drains back into the control unit, which also holds the water reservoir, by the means of a gravity siphon effect. This means that there is no water left in the system when it is not working and therefore nothing to freeze and cause damage. It also means that anti freeze chemicals are not required. This chemicals when added reduce the efficiency of the system.


The Low Flow Drain Back system  comprises three main components as follows:-

1) A 2.7 sq metre solar collector

The solar collector is designed for roof integration which means that it fits in place of the existing tiles/slates and forms an integral part of the roof. There are kits available for flat roofs.

2) A pre assembled control unit

The control units comprises a pump and the collector reservoir alongside the electronic micro processor control system. The DC pump requires 20 Volts DC and will start when a sensor on the solar collector registers sufficient solar energy striking the panel.

3) A Hot water cylinder with specific solar heat exchanger coil

The are various hot water cylinders available depending upon the individual requirements of  each location. They all have 60 mm of CFC free insulation and the micro bore heat exchanger is designed to provide the maximum heat transfer. A temperature sensor will switch off the pump when the 80C level is reached. All the cylinders have boiler inputs as well.