MISSION

Renewables

Intro

Different systems

There is a range of different system types and configurations for solar hot water systems. Some models use a small photovoltaic panel to power their circulating pump. Others use natural thermo siphon to circulate the water through the panel, thereby eliminating the need for ANY power source.

For areas that are liable to periods of freezing temperatures, a closed loop system is used, whereby an intermediary (anti-freeze) fluid and a heat exchange system heat the water in the tank indirectly. Other systems circulate and heat the water directly in the panels.

The system which best suits your needs depends on a range of factors, including:

1. Amount of south facing roof space.

2. Existing water heating system (e.g. some combi-boilers may not be suitable).

3. Your budget.

Cost and maintenance
Prices for installed systems average between £2,500-£4,000. Costs vary due to factors such as size of collector, type of roof, type of existing hot water system and geographic location. Alternatively you can fit or build the system yourself. It can work out cheaper (around £500-£1,500) but will take longer and youíll need a certain level of skill. You can get training and support from your local solar club.

Various organisations throughout the UK provide funding support for the installation of solar thermal systems. Solar hot water systems generally come with a 10-year warranty and require very little maintenance. A yearly check by the householder and a more detailed check every 3-5 years should be sufficient (although you should consult your system supplier for exact maintenance requirements).

Domestic installations
Usual requirements are:
Preferably 2-4m2 of southeast to southwest facing roof space that receives minimal shading during the main part of day, to locate the panels.

Space to locate an additional water cylinder if required, or a change to your existing one depending on the solar system.