Solar Hot Water Systems

Why Install A Solar Hot Water System?

A solar hot water system can generate up to 70% of the annual hot water requirements of a typical household. By reducing the on time of the boiler, gas, oil and LPG bills can be cut by up to 70%. With the introduction of the Renewable Heat Incentive in June 2011 it is estimated that the average home with an installed solar hot water system will receive an annual index linked tax free payment of around £350 per year for the next twenty years. Now has never been a better time to install a solar thermal system to your property.

How Does It All Work?

Diagram of a property with a solar thermal system installed.

A solar hot water system comprises of a dual coil domestic hot water cylinder (A), solar collectors (B) (roof or wall mount panels) and the Divicon controller (C).

  1. When there is sufficient solar energy heat is transferred in the solar collectors to the heat transfer medium.
  2. The heat transfer medium is pumped through the solar collector into the solar coil of the hot water cylinder where heat is transferred to the water within the cylinder.
  3. If the temperature drops due to water being drawn off for a bath or shower then the boiler will turn on to bring the water back up to temperature via the upper coil.
  4. The Divicon controller determines when to pump the heat transfer medium around the system. On sunny days it may often be necessary for the Divicon to inhibit the transfer medium passing through the solar coil in the cylinder to prevent overheating of the hot water.
  5. System maintenance concerns checking the PH level of the heat transfer medium and confirming correct operation of pumps and valves.