Why do they call it a hot water heater when hot water does not need heated??
111857
It doesn't make sense,it should just be called a water heater.It's about like driving on a parkway and parking on a driveway.
241754
Thermal intertia.  It works the other way too, cold water boils quicker than hot water.  The reason is when hot water is placed into the ice cube tray it immediately begins cooling.  Then when you put it into the freezer it continues to accelerate more and more quickly to the low temp desired.  Cold water would begin warming as soon as it gets put into the tray and then you have to cool it back down (opposite direction heating takes more energy)
266662
If the element is bad it will take forever to heat hot water back up. I would check that first before you put alot of money into it. Hope this helps.
945004
Some are photo electric...they turn light energy into electricity.\n\nSome are heat collectors...they store the heat and transfer it to the hot water heater.
412700
If you put hot water in the freezer it turns to ice faster.\n\nA famous scientist named Kelvin figured that out because hot water molecules move faster so the cold in the rfreezer makes them slow down faster than cold water molecules which are already moving slow, so hence the hot water freezes faster the hot water is "shocked" by the cold as it were.
510112
Yes most definitley, and my dear hubby is sure I do this to drive him insane. I say it gives the man something to do, follow me around shutting doors and cupboards. I even keep the bathroom door open, thats always fun. I also leave the hot water in the sink running to warm up, while I go around opening doors. In no time flat Im out of hot water. I think dear spouse should install me a second hot water tank the lazy butt!!!!!!!!!!!
94072
It depends on how hot you want your water. If you want only moderately heated water, suitable for bathing, you can use a box covered with glass that has a long winding pipe inside it. The pipe should be a small diameter and laid out flat on the bottom of the box with as many turns in it as possible to increas the length. This can go into a reservoir, like a hot water tank, and to make it more sophisticated you can put a circulating pump on the tank that constantly circulates the water through the heating panel. This is how commercial solar water heaters are made, with some sophisticated controls added. \n\nIf you want to boil your water using solar power this can be done with a parabolic mirror that focuses sunlight onto your cooking pot. These can be made from small pieces of mirror laid in a parabolic form (shaped like a satelitte dish) and cemented with plain grout. I have seen these used in some areas and they are quite effective. \n\nOne simple method that I use when camping: Lay a black colored bag of water on the ground or hang it in the sun and wait till it is warm enough for a shower.
711472
Solar energy is used for two types of devices: thermal, and photovoltaic.  For your water heater, you are talking thermal.  Put tubing into a black box with a clear cover, put the box in sunlight, and you have a solar water heater -- details vary, but they don't matter much.  Photovoltaic use silicon cells (usually called solar cells, or solar panels) to generate electricity.  Solar-cell powered garden lights, where the light is a light-emitting diode, are becoming popular and inexpensive.  The solar cells charge a nickel-cadmium battery during the day, and the battery powers the lamp at night.
311960
Cold tap water is about 50 degrees.  Hot is limited to about 120 to prevent scalding.  100 is what you might consider "warm" water.  There's more distance between cold water temperature and warm (100-50=50 degrees difference) than between hot water and warm (120-100=20 degrees difference)  Just looking at the numbers, you'd have to add 2.5 times as much hot to warm up the cold than the other way around.  (This is the basic idea - a more complicated description would require that I break out my heat transfer book...)
379326
wells u can do without electricity but water i dont think can do with out without electricity do the things the hard way without water probably die...
747796
Because the air is so thin, it has so little heat that water cannot exist as a liquid.  In other words, thinner air means colder temperatures, but that's kind of oversimplified.
714260
only if you put the hot water in a colder system than what you put the cold water into
866137
I have never heard of any school in the US not having hot water. I'm surprised at people's answers.  Pleas elaborate and tell us where in the US there's no hot water.
1032087
it gets hot, just its not a very good conductor of heat, therefore it cools off basically once the heats removed from it, so when you take it out, its not hot.
895444
if its still open, hot water in the shower a couple times...if not commercial solutions.
311950
There are 2 kind of Solar Panelz: Solar hot water panel and solar photovoltaic panels. The latter is harder to make, and is what akshaytruss is talking about. It is a solar panel that converts sunlight into electricity, while Solar Hot Water Panel converts sunlight into heat, in the form of hot water.\n\nHere is a link to create some "simple" photovoltaic solar panels. Don't expect them to be as good as factory made though. Factory made panels uses materials and processing that might be way too inconvinient to make at home\nhttp://www.thesolarplan.com/articles/your-own-solar-panel-collector.html\n\nOtherwise if you meant the solar water heater, that's easy to make, just a bit of piping and pumping and tanking
559100
I don't think you needed to boil the water at all.  Are you using tap water or bottled water?  If you use bottled water, you don't need to boil it.  Talk to your pediatrician.