50 gallon is best I've seen 40 gallon but it really depend on how many people live there
Mold grows the most in areas that are moist. In your home this would be near the washer and dryer, sinks and possibly the water heater or air conditioning unit.
Water is used in sinks, showers, baths, hoses, sprinklers, fountains, toilets, etc.
when hot waoter comes out of the shower you made have a water heater
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It is most likely the water heater. More specifically, the anode in the water heater likely needs to be replaced.
Techtanium is a brand of indirect water heater. It heats water for things like showers/baths, dishes, and anything else that requires hot water.
Generically this is known as sewage. Grey water (contaminated water from sinks and baths) can be reused for purposes like flushing toilets. Water from flushing toilets is "black" water and is sent off for treatment.
The washing machine does not heat water. It brings hot water in from the hot water heater. They are usually hooked into the same water supply as your shower and sinks.
A single tankless water heater will not cope with all that.
A fixture is something that attaches to the house like the water heater, furnace, dishwasher, sinks, toilets, bathtubs etc.
Plumbing is the way to get water into our homes. You would have no toilets, baths, showers or kitchen sinks without plumbing - we would be little better than cave dwellers.
Cold water sinks, hot water rises.