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50 Gallon Fuel Tank; Automatic reset circuit breakers; Back-up Light; Break-away safety valve; Cab roof vent; Combination heater and defroster, 42000 BTU; Combination stop, tail, and rear turn signals(2) Engine water conditioner (cummins engine) Engine stop control; Horn, electric, single tone; I.D. & clearance lamps; Low air pressure buzzer ...
A BTU is the energy required to raise one pound of water by one degree Fahrenheit. A US gallon of water weighs 8.3 pounds (3.8 kg). To raise 230 L (60 US gal) of water from 10 °C (50 °F) to 50 °C (122 °F) at 90% efficiency requires 60 × 8.3 × (122 − 50) × 1.11 = 39,840 BTU. A 46 kW (157,000 BTU/h) heater, as might exist in a tankless ...
Solar heat is clean and renewable. This is the most modern system. Increasingly, solar powered water heaters are being used. Their solar thermal collectors are installed outside dwellings, typically on the roof or walls or nearby, and the potable hot water storage tank is typically a pre-existing or new conventional water heater, or a water heater specifically designed for solar thermal.
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Companies must wean themselves off fossil fuels. Danish toymaker Lego said in October that it will spend about $1.4 billion to build a wind farm off the coast of Germany.