Maintenance costs money, while the travel involved takes also a toll on the environment, not least in terms of CO2 emissions. Solar antifreeze typically needs checking every year and should be replaced every seven years, so solar water heating systems which do not need it may, for some installations, be preferable over systems which do. To balance this, direct solar heating systems may need internal flushing out at a similar interval.
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Solar keymark certified
Micropower council
Renewable Energy Association
Association for Environment Conscious Building