ETS heating systems?

With the right heating element you can turn any water storage container into a water heater/storage unit that can be heated during off peak hours to use at another time,of course you would have to follow common hydronic principles such as room for expansion,pressure relief if its a closed system and lots of insulation to save BTU's from escaping unwanted.

Electricity prices need to be at attractive rates to consider this type of system,all though in my area I believe electric rates could rival the cost of propane and you wouldn't have any BTU's escaping up a flue.

Provided by our electric co-op and used with off-peak rates (the lowest offered here); available in plenum units for forced air, cabinet units, etc. No knowledge of user experience or satisfaction. Like most heat, obviously dependent on electricity. And probably competitive with propane at current rates as, other than wood, that is the competitive fuel in my area.

American Solartech in Maine has some very interesting storage tanks. I have been eying them for a couple of years now Also Builditsolar dot com has some great plans for solar, you could use the plans for the tanks.

Earth tubes look like air cooled/heated geo thermal units. You basically bury tubes underground and blow air through them. They could be buried in sand that could retain the heat.

I looked at books that talked about using sand and rocks to heat air but water has better heat retention qualities. The systems utilizing air and rocks looked very interesting and like they would work for most needs. But you need to be able to blow air through the system. You would need a storage area of roughly 10 times that needed to store water. (OK a guessimate at best for the storage area size but it is vastly alrger than that needed for storing heat in water.

I have to add that I have had too many mice die in my cars heater vents. they get in the system and either pee in the air vents or die in the fan. The smell, and potential health hazards of dead rodents in a full house heating system turned me toward water storage Just the though of having to rip up the yard, or tear sheet rock and insulation off the cellar trombe walls to find the dead mouse were enough to convince me to make a box out of ply wood, pt lumber and edpm rubber sheet material.

Hi,
If you do one of the non-pressurized water heat storage tanks, it can be used to store heat from multiple sources -- electricity, wood, solar, a heat pump, NG, ... Its a nice flexible way to go.

Some simple water heat storage tank designs: http://www.builditsolar.com/Projects/SpaceHeating/Components.htm#Storage

Gary