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ProgressivTube Passive Solar Water Heaters |
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The ProgressivTube is a passive system because it has no moving parts and operates in local water pressure and solar radiation. There are no pumps or controls to maintain and no electrical energy is required to make it function. |
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Once installed the system will operate automatically. When hot water is used in the household, solar pre-heated is drawn into the conventional water heater (reducing or eliminating electricity or gas usage for heating water) or directly to the tap. However, as with all solar water heaters, the total amount of solar contribution to the system is dependent upon the hot water consumption pattern, daily weather conditions, and variable amounts of available sunlight throughout the year. The collector/storage tank of the ProgressivTube absorbs solar radiation through its selective surface coating which raises the temperature of the water stored in the collector. It is well insulated with closed cell foam and the unit is double glazed for increased heat retention. The eight copper tubes are welded into a series flow pattern so that the top of the lower tube feeds the bottom of the next tube. This allows the ProgressivTube to contain the colder replacement water in the lower tubes where it is heated by the sun as it flows from one tube to the next. Each time hot water is used, the ProgressivTube's innovative design eliminates the cooling down of the remaining heated water that normally occurs in other types of batch heaters. Not only does this design ensure the delivery of the hottest water, but is also provides more hot water at a higher temperature and with a faster recovery time than solar systems of similar capacity. (return to questions) |
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First estimate your hot water demand in gallons per day; use the chart below for an average figure. It varies widely with lifestyle (from 10 to 30 gallons or more per person) and with season (most people take longer and hotter showers in the winter). For situations involving small families in large house, the number of bedrooms should be considered in sizing a solar water heater. A system sized to meet the needs of two people in a five bedroom house today will most likely be inadequate for a family of five living in the same house tomorrow .
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Note: add 15 gallons per additional person or 20 gallons per additional room. |
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Next, choose a system from the following chart based on the gallons required. Note that multiple units may be combined to achieve the total gallons desired.
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