batch solar water heater -Batch Solar Water Heater 4 Month Update

June 11, 2012 – 3:21 pm

Video ** A follow-up to my original video that describes a lot of hot water solar heater that I built. The water heater is currently supplying the home as a preheater for heating domestic hot water. Max water temperature observed: 165F.

** “PART ONE” TO BUILD A LOT FROM SOLAR WATER HEATER STOVE recycled water. Also known as a “Bread Box” solar water heater. Video Rating: 4 / 5

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  1. 40 Responses to “batch solar water heater -Batch Solar Water Heater 4 Month Update”

  2. i would suggest putting black roofing shingles inside the box frame ..they will hold heat much better …even fill the bottom of the tank with black silica sand

    By swanyut on Jun 11, 2012

  3. I know I can make that more alot more effiicant for under $20

    By muck1monkey on Jun 11, 2012

  4. could this be used along with some sort of radiator for home heating

    By gflatjam on Jun 11, 2012

  5. I know how to fix your over night heat loss problem.

    By HappyJackProduction1 on Jun 11, 2012

  6. Thanks for sharing your project with us…I am planning to build a solar preheater as well. I was wondering if placing solid bricks or ‘pavers’ in the box might absorb heat and slowly release it during the night. This might help with heat retention; would be interesting to know…

    By Prancinglion1 on Jun 11, 2012

  7. A couple of “poiner’s”….

    By pathman2 on Jun 11, 2012

  8. Your refractor idea is sound, but they must be outside the box to direct the rays inside. Interior refractors direct light back out. Just think of a solar oven and how it works – same exact principle. Don’t follow the design of most of the solar ovens on YT as most of them have their insides lined with foil.

    A large fresnel lens would increase the heat a great deal during the winter. You’d have to be *very* careful about setting it up though. BTW you should’ve painted the exterior black also.

    By kevjay777 on Jun 11, 2012

  9. The tank you see has been stripped of its foam insulation. The box and double paned glass do a good job of keeping the heat in at night.

    By KyleBostic on Jun 11, 2012

  10. Great work,

    is the water tank a heavily insulated type or just metal. I am wondering if was insulated how well the heat transfers?

    By fotosepp on Jun 11, 2012

  11. put the mirrors out of the box to increase the sun grean house efect just reflect more sun to the glass and tank

    By ingesumadre on Jun 11, 2012

  12. Hi, is the back of the tank touching the box or is it spaced away from it, was thinking of building one and tend to agree that painting the inside black would be better than using reflectors, would think that the tank would only need to be raised from the back if using the reflector method.

    By areeba2 on Jun 11, 2012

  13. Ok, Your right, its a better than nothing approach, heating the air inside and letting the tank absorb some of that and/or reduced lossees from the tankk due to a lower temperature difference. I’ve learned a bit more since then, and almost forgot I asked this question.

    By trailkeeper on Jun 11, 2012

  14. The sides are not connected in any way, however, because the box is air tight, having black sides helps raise the temperature of the box to over 200 degrees on sunny days, this “bakes” the tank and adds additional heat. I tried mirrors on the side because I did design them angled with that option in mind, the result was actually less heat. I presume this is because the mirrors were reflecting some radiation out. Mirrors are best used in projects that actively track the sun.

    By KyleBostic on Jun 11, 2012

  15. Because the sun goes “south” a bit, actually about 23.5 degrees, in winter-time, it might be a good option to angle the heater a bit south, or for yearly optimization, make it an adjustable angled design.

    By trailkeeper on Jun 11, 2012

  16. @trailkeeper this was also meant for @centervilletn for his question

    By trailkeeper on Jun 11, 2012

  17. Because the sun goes “south” a bit, actually about 23.5 degrees, in winter-time, it might be a good option to angle the heater a bit south, or for yearly optimization, make it an adjustable angled design.

    By trailkeeper on Jun 11, 2012

  18. I see you have black coated insides of the collector box. Are the sides connected to the water tank in any way? Would it help to use reflective sides to reflect any heat energy back to the water tank?

    By trailkeeper on Jun 11, 2012

  19. ill look up the weather data…i read the some info regarding degree of angle (Ill see if i can find the link) ..but i think optimum is your latitude +15 degrees is best…ill post you the link when i find it…

    By centervilletn on Jun 11, 2012

  20. I live in Palestine Texas, I would pull up the weather averages for your location and mine and compare them. The biggest factor is number of sunny days and length of daylight. Solar insolation charts used for solar panel installations tend to be good indicators of performance. This heater is facing directly south angled at 30 degrees (my latitude.) Thanks!

    By KyleBostic on Jun 11, 2012

  21. @water4fuelh20 Great question, even before this tank installation, we had a case of SO2 gas buildup due to bacteria in the domestic water heater since the well water is obviously not chlorinated. We remedied the issue by shocking the well with bleach. About a month ago I did smell SO2 gas again in the water. Once again we shocked the well, lines, and tanks and it took care of the problem. All of our drinking water is filtered with reverse osmosis. We have not had any ill effects thus far.

    By KyleBostic on Jun 12, 2012

  22. – looking good. Just keep an eye on that PVC and the condition of the wood like you have been. Thanks for the update^^

    By cantecleer on Jun 12, 2012

  23. Outstanding project! Thanks for the update.

    By boat6868 on Jun 12, 2012

  24. excellent video….what state are you located in..i live in tennessee and was wondering if i can expect similar results…and one more question..what direction is your heater facing? south?

    By centervilletn on Jun 12, 2012

  25. Wonderful. I wonder what it would work like in the winter time… THANKS !!

    By Teddybearcop48 on Jun 12, 2012

  26. I love your heater, you should check out the solar water heater I built for northern vermont. we get much less sun so it had to be a different design. the video is on my page, let me know what you think.

    By nekbiodieselworks on Jun 12, 2012

  27. good morning mister ! you are very bravo !! with the solar energy compliment from italy to danilo !!!

    By danilo7628 on Jun 12, 2012

  28. good, simple design

    By wwf1968 on Jun 12, 2012

  29. Was wondering, do you need to leave the anode rod in the tank or do you remove it? Is it still needed to prevent inside tank corrosion? Also do you use the same relief valve that came with the heater and can it handle the temperature and internal pressure the tank would get being inside a heated box?

    By Progrocker70 on Jun 12, 2012

  30. Isn’t it truly amazing that everyone with a conventional water heater isn’t using one of these in place of it or as a preheater.

    By jeffmolly1 on Jun 12, 2012

  31. Before I striped the cover off the tank I marked the cold pipe so I knew which pipe to use for hot and cold. On my tank in the solar heater the inlet(cold/long pipe)
    is on the bottom, and the (hot/short pipe) is on the top. Also,the bottom of the tank is lower than the top inside the box.

    By BACKYARDSOLAR on Jun 12, 2012

  32. I noticed you plumbed your hot outlet and cold inlet from the same end. Looking at the interior diagram of a gas water heater, there’s dip tube (cold inlet) that is longer than the hot outlet tube. How did you determine which outlet was cold and hot so you could turn the hot (short) up and cold (long) down? Also why didn’t you opt to plumb your hot outlet from the bottom drain valve? (I saw a diagram on this. Wondered if it would make a difference in heat level.)

    By KasinH on Jun 12, 2012

  33. In the summer, It will drop from around 140 to about 120/110 deg. in 8-12hrs.
    being covered with a hot tub cover. In the winter I noticed it drops from 120 to 95 deg, in about 5 hrs. In the winter I try to take showers right when the sun gos down, to get the water while it at its hottest. If you haven’t already, check out Part 3′ of my videos for more info. Thanks for the comment. Todd

    By BACKYARDSOLAR on Jun 12, 2012

  34. how much does it cool down over night ?

    By ItsForYourSafety on Jun 12, 2012

  35. Ok, Ok…. Sorry I know I used the term
    “Here’s where I’m at so far” to many times. I will be making “Part 3″ here real soon, and I will have all the details on how well the unit is doing.

    By BACKYARDSOLAR on Jun 12, 2012

  36. Water temp ranged from 130 to 140 degrees at the end of the day. It takes a full day for the water to go from cold to hot.

    By BACKYARDSOLAR on Jun 12, 2012

  37. Please.
    What was the final temperature of the water?
    and
    how many minutes did it take to get the water from room temperature (or tap water temperature) till it was that hot?

    By penguinistas on Jun 12, 2012

  38. lol.. good stuff amigo.. But where are you at so far? :)

    By Bobbydog69 on Jun 12, 2012

  39. if you still have the Outer shell for the water heater try shining it to high mirror type finish it will heat the water even more

    By neven01 on Jun 12, 2012

  40. Looks pretty hot.

    By sharon102645 on Jun 12, 2012

  41. Amazing! Human ingenuity, I love it.

    By darkvader47 on Jun 12, 2012

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