Its a 21vp50E-1
Tank water heater? if so its because the water is much colder this time of year. water heater has to work harder to heat 40deg. water than 70deg. water in the summer. That also means as you use the hot water from the tank its replaced with very cold water. Causing you to have less hot water. Either get a larger water heater. Or even better go tankless and have never ending hot water and save money at the same time.
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