They don’t have to concern sick, get one with a digital read out and memory button, it should go to zero or have any questions, they don’t signalling to a certain amount will be achieved over time, just check peak every day, even if it goes to 20 I would start looking.
At the present time makes gurgling sounds (such as marbles rolling around in the tank) when the hot water faucet down included. Is the drainage/flushing water heater now (that should be done every 6-12 months) a bad idea?
The Code will allow whether machine and dryer at the same chain? I have a European-style washer with a 240 volt plug (NEMA 6-20P) and I just bought it matches dryer, which in North America dry connector.