Definitely.
answer yes the mouse has probaly also chewed thru wires causing a short
how to build a diesel heater
the heater core
Your heater core may have gone out. Or you could have build-up in the lines.
A fishy smell coming from your heater could be due to a build-up of bacteria or mold in the system. It is important to have a professional inspect and clean your heater to prevent any potential health hazards.
you put one on top of the other repeatedly
The ticking could be just the pipes expanding and contracting. Or, the heating elements could have a build up that occurs over time.
To prevent sediment build-up in your water heater, you can flush the tank regularly to remove any accumulated sediment. This can help maintain the efficiency and longevity of your water heater.
6.8 ohms is a standard value, and 6.8 is within 0.74% of 6.75. If you need a precise value, use a potentiometer or start playing with resistors, because resistors have tolerance and you will not be able to build an exact 6.75 by just looking at values - you need to measure combinations.
There are a couple of reasons why your hot water heater would groan. The valves may not be opened correctly. Or there could be a build up of dirt on the bottom of the tank. Clean out the sediment by letting the water run out until it is clear and this should help.
Robert the Bruce watched the spider repeatedly building a web.
There are a great many things you could build a fence out of. You could build a fence out of wood.
A resistor pair is two resistors, often matched as to temperature coefficient and/or tolerance. This allows you to build a highly accurate and stable voltage divider.