The use of solar energy to preheat domestic hot water in hotels and motels has mony advantages. Year long use of these solar systems provides shorter payback periods. Temperature requirements for hotel/motel use are relatively low and are compatible with low cost flat platt collectors. Simple controls relate to higher reliability in both drain-down and heat exchanger configurations. Solar systems are easily retrofitted to most existing hotel/motel hot water systems and there are many hotels and motels across the country with roof area sufficient in size to hold the required collector arrays. Hotel/motel systems with pay-back periods of less than four years, which provide 70％ of the total hot water load, are discussed.
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