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Avoid wasting hot water.
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Install low flow taps and shower head.
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Fix any tap leaking immediately.
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Set your boiler's thermostat at 49°C.
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Insulate your boiler and the first two meters of the hot and cold water pipes connected with it. Follow the manufacturer's instructions and do not cover the thermostat.
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Buy an A+++ energy efficiency boiler and white appliances.
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Beyond these solutions, the solar water heater option is the best possible. For an average family, the cost is depreciated in 3-4 years.