Only if if has a leak.
A tankless water heater is much more efficient as it "flash" heats the water.
Yes, you will need a hot water tank for your water heater. There are, however, some tankless water heaters on the market. They cost a bit more, but there is a federal tax credit on them.
No and yes. No, you won't get more water pressure. To do that you'll need to find out why the water pressure is low. Perhaps flow restriction, perhaps a poorly adjusted water pressure regulator, perhaps low pressure from the well/city water. But an additional water heater will certainly give you more hot water. It would be like putting in a LARGER water heater. In most cities the water pressure required is about 20 PSI. Small city's do not add pressure pumps to their system but use a gravity supply. That is why most places there is a pressure problem either build their water tanks taller or erect them on a hill.
Solar water heating is generally more cost effective than an electrical water heater. Though solar water heaters usually have a higher initial investment if commercially purchased.
It sounds more like a water heater issue, more than likely you are heating your water with a boiler and there are either coil cleaning or, control issues.
It is most likely the water heater. More specifically, the anode in the water heater likely needs to be replaced.
most likely cause will be a faulty fan speed resistor.shouldnt cost more than $50 to replace
The clutch fan will not cause this issue. The more likely causes are a stuck open thermostat or coolant not flowing properly through the heater core.
An automobile's heater that blows only cold air could either be a faulty thermostat or, more likely, a faulty heater core. A trip to a mechanic or shop that specializes in radiator and cooling system repair should be able to diagnose and repair any problems.
Normally NO
Determine what is causing the problem, faulty belt tensioner, alternator water pump, a/c compressor, one or more of these components could cause the problem.
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.
A tankless water heater is much more efficient as it "flash" heats the water.
Probably not. It sounds more like a faulty water pump, water tank, or well. Most likely the water pump is directly at fault, but faulty tank pressure, bad electrical supply, or a bad well can cause the pump to do that. Especially if the surges are repetitive in nature, your pump is short-cycling. With lots of research, you might be able to narrow down the problem.
Yes, a faulty O2 sensor might cause a 1993 Sidekick to stall. It would also cause the car to misfire and use far more gasoline that it needs.
First change out the themostat. If problem persists , it most likely is the water pump. Too much clearance around the impeller causes slow water movement and does not circulate to the heater core properly.
Water heater fan? I have never seen a "water heater" with a fan. Possible a boiler, hot water heating system. Assuming you are talking about a "water heater" in a house. Please give a little more information on where it is and what it is intended to do.