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.
Hot water heater problems are more common in the winter, due to the constant usage; this is especially true, if your water heater is run on gas.
When you want to know when your hot water heater is broken, simply run your faucet and test the water. If it's cold, the heater is broken.
Your hot water heater may run out of hot water quickly due to factors such as a small tank size, high demand for hot water, or a malfunctioning heating element. It is important to consider these factors and possibly upgrade your water heater or have it serviced to improve its performance.
Your hot water heater may run out of hot water quickly due to factors such as a small tank size, high demand for hot water, or a malfunctioning heating element. Consider upgrading to a larger tank or a more efficient water heater to address this issue.
The heater has a little radiator in it and it may be enough to cool a engine that is running hot
Since they run in parallel, there's no way that a heater core will cause a radiator to get hot.
The heating element is probably broken
You do not run out of hot water, and do not lose energy in storing hot water.
You constantly need hot water
None.
You run out hot water because you must have a small water heater. A water heater gets water, and heats it up, so if you have a small one, then once you use up all the hot water, you need to wait a while for the heater to heat up more.
Your water heater may run out of hot water quickly due to factors such as a small tank size, high demand for hot water, or a malfunctioning heating element. Consider upgrading to a larger tank or a more efficient water heater to address this issue.