Tankless Water Heater Sizing For Whole Home Demand
Tankless Water Heater Sizing For Whole Home Demand A tankless water heater that is correctly sized feels like magic the first time you run a shower and the dishwasher at once and nothing flinches. A tankless unit that is undersized, by contrast, will give the cold-water sandwich its name, drop your shower to lukewarm whenever the kitchen sink opens, and frustrate everyone in the household within a week. Unlike a storage tank, which buys you time with a reservoir of pre-heated water, a tankless water heater must heat every gallon at the exact moment of use. Sizing is therefore not a casual decision. It is the single most important specification you choose, and getting it wrong is expensive to correct after the unit is mounted on the wall. Why Tank Sizing Logic Does Not Apply If you have ever replaced a storage water heater, you know the drill: count bedrooms, pick 40, 50, or 75 gallons, and move on. That heuristic is useless for tankless units because there is no reservoir....
