Why are you trying to store water for a water change?
Certainly a drip system would avoid storing water, but from my observation, many (could be very many) people with large tanks run them without drip systems and without storing water. I certainly don't see a need to have a storage set up to hold water.
A house with a 50 gallon hot water heater can provide 100 gallons of 120 F water over a span of 25 minutes (50 from storage and 50 more processed at 2 gallons per minute.) Mixed with cold water at 50 F will create 350 gallons of 70 F water. (You could keep the hot water at 140 F but I advise against it as it increases the chance of burns.)
350 gallons of 70 F water mixed with 650 gallons of 84 F water will cause a drop in temp from 84 F to 79 F over a span of 25 minutes which is far from a debilitating decline for most if not all fresh water fish.
You could even take longer to complete the WC. A 50 minute WC would provide 150 gallons of 120 F water, enabling a 400 gallon WC (40%) with 76 F water. That's a decline from 84 F to 81 F.
Of course if you want to make an 80% WC, you will then want to 1) take longer to change; or 2) get a larger water heater; or 3) get one that heats cold water faster; or 4) raise your target water heater temperature setting higher; or 5) lower the tank target temp below 84. Or some combination of those 5.
And none of those points take into account that the heaters in the tank will be heating the water as it enters the tank mitigating any decline in water temperature.
Certainly a drip system would avoid storing water, but from my observation, many (could be very many) people with large tanks run them without drip systems and without storing water. I certainly don't see a need to have a storage set up to hold water.
A house with a 50 gallon hot water heater can provide 100 gallons of 120 F water over a span of 25 minutes (50 from storage and 50 more processed at 2 gallons per minute.) Mixed with cold water at 50 F will create 350 gallons of 70 F water. (You could keep the hot water at 140 F but I advise against it as it increases the chance of burns.)
350 gallons of 70 F water mixed with 650 gallons of 84 F water will cause a drop in temp from 84 F to 79 F over a span of 25 minutes which is far from a debilitating decline for most if not all fresh water fish.
You could even take longer to complete the WC. A 50 minute WC would provide 150 gallons of 120 F water, enabling a 400 gallon WC (40%) with 76 F water. That's a decline from 84 F to 81 F.
Of course if you want to make an 80% WC, you will then want to 1) take longer to change; or 2) get a larger water heater; or 3) get one that heats cold water faster; or 4) raise your target water heater temperature setting higher; or 5) lower the tank target temp below 84. Or some combination of those 5.
And none of those points take into account that the heaters in the tank will be heating the water as it enters the tank mitigating any decline in water temperature.
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