Water Heating
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 10 Evacuated Tubes Heat pipe solar collector of solar water heater Pressurized $359.99 (1 Bid) Time Remaining: 8h 25m |
 BRAND NEW AMERICAN HEAT 2500 SHOWER HEAD WATER HEATER $95.00 Time Remaining: 16d 11h 8m Buy It Now for only: $95.00 |
 American Heat Shower Head Tankless Water Heater $99.95 Time Remaining: 26d 10m Buy It Now for only: $99.95 |
 New Water Heater Replacement Heating Element Free Shipping $8.99 Time Remaining: 28d 13h 38m Buy It Now for only: $8.99 |
 Richmond Hot Water Heater Heating Element RP12894 240V 2500W $4.99 Time Remaining: 29d 15h 34m Buy It Now for only: $4.99 |
 American Heat ADK 1 M12 Whole House Tankless Water Heater $227.99 Time Remaining: 9h 31m |
 18x18 Water to Air Heat Exchanger $133.20 Time Remaining: 3d 13h 31m Buy It Now for only: $133.20 |
 Heat Fab RTG20007 Rheem Tankless Water Heater Installation Vent Kit 4 $225.00 Time Remaining: 23d 15h 40m Buy It Now for only: $225.00 |
 10 Plate Water to Water Brazed Plate Heat Exchanger $93.60 Time Remaining: 10d 21h 47m Buy It Now for only: $93.60 |
 1 pcs of Temperature sensor PT1000 for Solar Water Heater for solar heating $13.03 Time Remaining: 13d 8h 6m Buy It Now for only: $13.03 |
 American Heat AH 18 Whole House Tankless Water Heater $391.00 Time Remaining: 10h 31m |
 Water Heater Screw In Heating Element 4500 watt 240v $15.99 Time Remaining: 17d 15h 20m Buy It Now for only: $15.99 |
 12x18 Water to Air Heat Exchanger NEW front mounting $99.00 Time Remaining: 20d 18h 36m Buy It Now for only: $99.00 |
 18x20 Water to Air Heat Exchanger for Dehumidification Outdoor Boiler Furnace $161.50 Time Remaining: 6d 23h 2m Buy It Now for only: $161.50 |
 1125 x 45 40 Plate Heat Exchanger Stainless Steel Copper Brazed B3 32A Water $292.00 Time Remaining: 2d 16h 50m Buy It Now for only: $292.00 |
 American Heat ADK 1 M12 Whole House Tankless Water Heater $0.01 Time Remaining: 12h 31m |
 New Emerson Appliance Replacement Water Heater Element 240 Volts 2000 Watts 11 $15.99 Time Remaining: 5d 13h 29m Buy It Now for only: $15.99 |
 20x20 Water to Air Heat Exchanger Outdoor Wood Furnace $163.80 Time Remaining: 14d 18h 9m Buy It Now for only: $163.80 |
 19x20 Water to Air Heat Exchanger With Install Kit $203.40 Time Remaining: 20d 18h 36m Buy It Now for only: $203.40 |
 50 Plate Water to Water Brazed Plate Heat Exchanger $261.00 Time Remaining: 23d 16h Buy It Now for only: $261.00 |
 American Heat AH 27 Whole House Tankless Water Heater $127.50 (7 Bids) Time Remaining: 13h 32m |
 M 14 American Heat Electric 14 KW Tankless Water Heater ADK 14 $242.50 Time Remaining: 18d 15h 9m Buy It Now for only: $242.50 |
 Side Arm Heat Exchanger Fin Enhanced Water Heater Outdoor Wood Furnace Stove to $118.99 Time Remaining: 19d 15h 31m Buy It Now for only: $118.99 |
 Water Heater Screw In Heating Element 3500 watt 240v $16.75 Time Remaining: 17d 15h 18m Buy It Now for only: $16.75 |
 B3 12A 75 x 29 40 Plate Stainless Steel Heat Exchanger Copper Brazed Water $94.95 Time Remaining: 22d 23h 13m Buy It Now for only: $94.95 |
 American Heat M16 KW Whole House Tankless Water Heater $269.00 Time Remaining: 14h 31m |
 AO SMITH Voltex Hybrid Electric Heat Pump Water Heater $1,975.50 Time Remaining: 20d 11h 23m Buy It Now for only: $1,975.50 |
 B3 12A 20 Plate Heat Exchanger 75 x 29 Stainless Steel Copper Brazed Water $59.95 Time Remaining: 25d 2h 31m Buy It Now for only: $59.95 |
 AIRGENERATE AIRTAP RETROFIT A7 HEAT PUMP WATER HEATER 7000 BTU GAS ELECTRIC A 7 $437.00 Time Remaining: 23d 13h Buy It Now for only: $437.00 |
 12x12 Water to Air Heat Exchanger New style Much EASIER to install $90.00 Time Remaining: 17d 11h 42m Buy It Now for only: $90.00 |
 American Heat ADK 1 Whole House Tankless Water Heater $249.00 Time Remaining: 15h 31m |
 30 Plate Water to Water Brazed Plate Heat Exchanger $178.20 Time Remaining: 23d 15h 59m Buy It Now for only: $178.20 |
 Water Heater Screw in 8 Heating Element 2000 watt 120v $14.49 Time Remaining: 17d 14h 58m Buy It Now for only: $14.49 |
 Water Heater Heating Element 9000095 4500W 240V NEW $14.99 Time Remaining: 18d 7h 44m Buy It Now for only: $14.99 |
 20x20 Water to Air Heat Exchanger NEW front mounting $180.00 Time Remaining: 20d 18h 36m Buy It Now for only: $180.00 |
 American Heat M16 KW Whole House Titan Tankless Water Heater $269.00 Time Remaining: 16h 31m |
 Water to air heat exchangers outdoor wood furnaces solar geo thermal cooling $139.50 Time Remaining: 13d 11h 26m Buy It Now for only: $139.50 |
 3 FOOT EASY HEAT WATER PIPE HEATING CABLE HEAT TAPE KIT 3 AHB 013 NEW $19.99 Time Remaining: 25d 11h 4m Buy It Now for only: $19.99 |
 70 Plate Water to Water Brazed Plate Heat Exchanger $334.80 Time Remaining: 23d 16h Buy It Now for only: $334.80 |
 Water Heater Square Flng Heating Element 1500 watt 120v $16.99 Time Remaining: 17d 15h 59m Buy It Now for only: $16.99 |
 American Heat ADK M12 Whole House Titan Tankless Water Heater $0.01 Time Remaining: 18h 31m |
 B3 12A 30 Plate Heat Exchanger 75 x 29 Stainless Steel Copper Brazed Water $79.95 Time Remaining: 25d 2h 31m Buy It Now for only: $79.95 |
 Craftmaster 6900639 Heating Element for Hot Water Heater 4 Bolt Flange 4500W $9.89 Time Remaining: 4d 29m Buy It Now for only: $9.89 |
 30 FOOT EASY HEAT WATER PIPE HEATING CABLE HEAT TAPE KIT 30 AHB 130 NEW $22.99 Time Remaining: 25d 14h 42m Buy It Now for only: $22.99 |
 90 Plate Water to Water Brazed Plate Heat Exchanger $449.00 Time Remaining: 27d 13h 23m Buy It Now for only: $449.00 |
 American Heat ADK 1 M12 Whole House Tankless Water Heater $185.00 Time Remaining: 22h 31m |
 EXHAUST FLUE PIPE FOR RENNAI WATER HEATING SYSTEM OPEN BOX WITH GASKETS $35.00 Time Remaining: 25d 2h 48m Buy It Now for only: $35.00 |
 American Heat AH 27 Whole House Tankless Water Heater $599.00 Time Remaining: 26d 24m Buy It Now for only: $599.00 |
 Brand New Universal Heating Element for Water Heaters 4500W 240V or 3500W 208V $7.00 Time Remaining: 18d 13h 53m Buy It Now for only: $7.00 |
 24x24 Water to Air Heat Exchanger NEW front mounting $269.10 Time Remaining: 18d 18h 39m Buy It Now for only: $269.10 |
 Heating Element for Hot Water Heaters 1500Watt 120V $7.99 Time Remaining: 4d 15h 2m |
 M 12 American Heat Electric 12 KW Tankless Water Heater ADK 12 $230.00 Time Remaining: 18d 15h 6m Buy It Now for only: $230.00 |
 Water Heater Screw in 8 Heating Element 1750 watt 120v $15.99 Time Remaining: 17d 15h 7m Buy It Now for only: $15.99 |
 240000 BTU Cupro Nickel Salt Water Pool Heat Exchanger $699.00 Time Remaining: 11d 10h 22m Buy It Now for only: $699.00 |
 WATER HEATING ELEMENT BOLT IN FLANGE GASKET KIT PROPLUS $8.00 Time Remaining: 15d 22h 44m Buy It Now for only: $8.00 |
 FHP Geothermal Central AC Units Water Source Florida Heat Pump $990.00 (1 Bid) Time Remaining: 17h 55m |
 CONTROLLER of SOLAR WATER HEATER 3 sensors 12V for solar water heating system $79.99 Time Remaining: 7d 10h 54m Buy It Now for only: $79.99 |
 American Heat ADK 1 Whole House Tankless Water Heater $227.99 Time Remaining: 26d 13m Buy It Now for only: $227.99 |
 Water Heater Screw In Heating Element 3000 watt 240v $16.75 Time Remaining: 17d 15h 15m Buy It Now for only: $16.75 |
 M 9 American Heat Electric 9KW Tankless Water Heater ADK 9 $230.00 Time Remaining: 23d 10h 11m Buy It Now for only: $230.00 |
 Hybrid Heat Pump Electric Water Heater $950.00 Time Remaining: 2d 15h 51m Buy It Now for only: $1,075.00 |
 16x16 Water to Air Heat Exchanger Outdoor Wood Furnace $113.40 Time Remaining: 14d 18h 6m Buy It Now for only: $113.40 |
 18x18 Water to Air Heat Exchanger Outdoor Wood Furnace $128.70 Time Remaining: 14d 18h 8m Buy It Now for only: $128.70 |
 Installation kit for water to air heat exchangers $29.70 Time Remaining: 5d 12h 59m Buy It Now for only: $29.70 |
 18x20 Water to Air Heat Exchanger $184.00 Time Remaining: 7d 15h 4m Buy It Now for only: $184.00 |
 SR1188 controller for solar water heating systemsELA485 connection with PC $180.00 Time Remaining: 3d 5h 14m Buy It Now for only: $220.00 |
 New Bradford White 265 42544 08 Replacement Electric Water Heating Element $14.95 Time Remaining: 7d 10h 7m Buy It Now for only: $14.95 |
 Double Wall 28 Plate 316L Heat Exchanger for Solar Water Heaters Etc $155.00 Time Remaining: 13d 19h 18m Buy It Now for only: $155.00 |
 40 Plate Water to Water Brazed Plate Heat Exchanger $216.00 Time Remaining: 23d 16h Buy It Now for only: $216.00 |
 Hot Water Duct Coil Heat Exchanger nominal 20 X 20 $195.00 Time Remaining: 14d 17h 33m Buy It Now for only: $195.00 |
 FLOOR MOUNT HEATING CONVECTOR HYDRONIC HOT WATER HEAT BOILER HEAT 3 LONG $86.99 Time Remaining: 3d 19h 41m |
 Laars Endurance EBP 175 Propane Gas Fired Hot Water Heating Hydronic Boiler NEW $2,350.00 Time Remaining: 10d 19h 50m Buy It Now for only: $2,350.00 |
 15x20 Water to Air Heat Exchanger Boiler Furnace Stove Hot Water Duct Coil $141.95 Time Remaining: 19d 56m Buy It Now for only: $141.95 |
 1907 Ad Pierce Butler Steam Hot Water Heating Plumbing ORIGINAL ADVERTISING $37.95 Time Remaining: 25d 18h 8m Buy It Now for only: $37.95 |
 Bradford Electric Water Heating Element 265 42544 11 $9.99 Time Remaining: 1d 16h 42m Buy It Now for only: $9.99 |
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Solar Water Heating and Tankless Water Heater
How does a Solar Water Heating system work a Tankless Water Heater? First let us a take a look at how solar hot water heating works.
In general there are solar collectors that capture the sun's heat and transfer it to some liquid medium. That liquid medium can be the hot water used later or a special liquid that transfers the heat through a heat exchanger to the water, warming it.
The solar collectors can be made from different materials. Copper and Glass are common. If you look at your car's radiator you'll see fins attached to a series of pipes. Here the engine's heat is transferred through antifreeze or water to the radiator. The radiator will then RADIATE the heat to the surroundings and therefore cooling the engine's cooling fluid. The fins provide added physical radiation area for faster cooling and smaller radiator.
Now, Solar Water Heating works just like that, only the process is reversed. The fins or other surface expanding area is used to capture the sun's heat and heat the water or some other fluid.
All solar water heating systems have a storage tank and circulation system. The water is heated in the solar panels and then stored in a storage tank that looks like the regular storage water heater tank. The solar tank is much better insulated and retains the heat better since it doesn't have a venting flue like the traditional tank.
In a direct solar system the water in the storage tank is then circulated through the panels to be heated when exposed to the sun and return to the tank again. This system can work without a pump or with a pump, depending on the system's design.
A temperature controlled mixing valve will then mix the water from the tank with fresh cold water to get the desired water temperature that is set to. There are various safety components to control the water pressure and temperature in the panels and the tank and prevent over heating of the components.
Combined with Tankless Water Heater
The tankless water heater's computer always measures the incoming fresh cold water temperature and adjusts its gas burner's so the set hot water temperature can be achieved. The measurement of the outgoing heated water and the incoming water happens many hundred times a minute. The computer then regulates the gas supply to the burner and measures the burner's efficiency and regulates the oxygen for optimum combustion.
The incoming water to the tankless water heater can be of any temperature, almost. The computer can normally vary the combustion from approx. 5% to 100%. A simple example without consideration of water volume is if the hot water temperature is set to 120 deg. F and the incoming water temperature is at 60 deg. F the combustion would be set for 100%. If the incoming water temperature is 120 deg. F then the combustion is set to 0% and the burner would not be fired up. The tankless water heater is able to "pass through" the incoming water if it is approx. equal to its set hot water temperature but it CANNOT cool the water.
A solar water heating system can easily be used with a tankless water heater. It is one of the most economical ways of heating water. The outgoing heated water supply of a solar heating system can be the incoming water supply of the tankless water heater. Anytime the water is below the desired hot water temperature the tankless water heater would heat it to the set temperature and if already at that temperature it would simply "pass through" the hot water.
If such a system is designed and sized properly it can be run with a small tankless water heater that will act only as an auxiliary heater to the solar system during cloudy days and be very cost effective and energy saving.
About the Author
Al Sagafi has extensive engineering and field experience in energy conservation and renewable energy production. He is actively involved at http://www.JustTankless.com and http://www.allied-solar.com. He holds California State General Building and Electrical Contractor licenses.