Tank water will slowly warm to ambient temperature. It will not get any hotter.
Usually about an hour.
An immersion heater is used to heat water for purposes such as bathing or showering. The amount of hot water produced depends on how long the heater is switched on for.
You can not get heat from cold water, The engine has to run long enough to get the water in the engine HOT. That is were you get heat from HOT WATER-- Coolent
It depends on the how many degrees you wish to change the water and the wattage of the heater. Obviously a 1500 watt heater will do it faster than a 1000 watt heater. You might want to begin by looking at the heat transfer formula: heat in joules equals mass times change in temperature times specific heat of the material (water in this case).
Less than 3 minutes! It shouldn't take that long
In the long run a Rheem Tankless water heater will save you money in the long run by heating the water faster and you will have to run the water for a shorter amount of time for it to heat up.
The source of heat for the system is water/coolant from the radiator circulating through a heater core under the dash. Without the engine running and water circulating, there won't be any heat in the passenger compartment. There is residual heat after turning the engine off, but that won't last long. If the blower fan does not shut off, the resistor has failed.
Around 3 hours
Yes, but it will still not be very hot unless it sits in the sun all day. You could use a solar heater to heat the water for the tub in the summer. You can make this with a long water hose and a pump. Put the hose in the sun and pump water through it.
A very basic answer is: The hot water the engine produces is circulated thru the heater core. The heater core looks like the autos radiator only smaller. The heater core is located inside the heater box. So as the engines hot water circulates thru the heater core the heat will transfer into the heater box. As long as the engine is running and everything is working properly the heater core will stay hot inside the heater box.
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They may as long as the surrounding air is warm enough and the water chemistry is to their liking.