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Not enough hot water for bath

water consumption bathtub

walk in tub
Something is not right if you cannot get a bath from water heater...

1) Crossover problem?
Bad faucet cartridge, and other issues can cause hot water shortage.
Test for crossover
Low hot water pressure

2) Oversized bathtub can use 70 gallons hot water
Small bath 15+ gallons hot, walk-in tub 45 gallon hot, shower 6-9 gallon hot
How-much-hot-water-does-bath-or-shower-use
Two water heaters

3) Is water heater putting out correct amount of hot water?
Test amount-of-hot-water.pdf
Test-hot-water-Volume.pdf
How far hot water travels in pipe

4) Look at yellow label on side of tank for first hour delivery: this will be the average expected amount of hot water the heater should provide before water turns cold.
The average will decrease in winter with colder incoming water.
Calculate first hour delivery
Calculate recovery
Ways to increase amount of hot water
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