If you are referring to imperial gallons, about 45 inches tall.
The blast radius of a 250 gallon propane tank would be 100 yards
about 100 lbs
It is a water heater, not a hot water heater. There would be little point in using a hot water heater. I assume that is your point.
yes but it would need a heater as they are both tropical fish and you would need to change the water alot.
The efficiency would be about the same. The only difference would be the time factor. The larger the heating element, the quicker the water would get to temperature. One other factor to consider it the insulation factor of the tank. The more insulation around the tank the longer the water will stay at temperature the less energy is used to maintain the temperature of the water in the tank. Also to consider is the incoming temperature of the cold water entering the tank. The colder the water the longer the time factor is to heat the water to a specific temperature.
depends on the wattage of the elements along with the temp of the cold water but i would guess an hour or two
Of course a water heater thermostat would be defective as water heaters / hydronic boilers would use an Aqua Stat
my guess would be 1 gallon of water.
Check that there isn't water around the water heater first, which would mean that turning it off and closing the water valve would be a good idea. Then, check the fuse box to see if the power has tripped--that is if it is an electric water heater.
My bet would be the hot water heater cycling water through
Personally I would not, as the cold water could thermo-shock the heater. And if you have a glass-lined tank, it will crack it and shorten the life of the tank. I would follow the manufacturer's instructions.
Why would anyone put dirt in a water heater ?? Normally water heaters have sediment from the minerials in the water supply and the instructions furnished with the heater tells how to cure this problem