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Practice 10 You bought a house two years ago and the hot water heater just died. You are considering replacing it with an updated version
Practice 10 You bought a house two years ago and the hot water heater just died. You are considering replacing it with an updated version of the same model, which would cost you $200 including installation. Your family consumes about 300 gal of hot water daily, which costs you $230 each year. The new tank comes with a 20-year guarantee, and at the end of that time, you assume it would be discarded and a new version installed, so zero salvage cost. Alternatively, you have been researching solar powered hot water systems and found a system that would meet your family's requirements. It includes two solar panels and a storage tank with an auxiliary heating coil for those cloudy days. Total cost for this new system is $1400 including installation. To power the backup system is estimated to cost $60/year, and every fourth year, starting in year 4, $180 of maintenance is required. At the 20-year point, you assume technology would have improved so this system would have zero value, and a new system would be installed. Assuming an 8% discount rate, which system would be more economical over the 20-year life? When would the two systems be equal in cost
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