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BS EN 13203-3. Solar supported gas-fired domestic appliances producing hot water. Appliances not exceeding 70 kW heat input and 500 litres water storage capacity. Part 3. Assessment of energy consumption|Solar heating, Water heaters, Storage water heaters, Solar collectors, Energy consumption, Gas-fired heaters, Testing conditions, Hot-water central heating, Hot-water supply systems, Gas-powered devices, Domestic, Hot-water boilers, Mathematical calculations
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