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Water Heater Sizing Calculator
Tank and Tankless Requirements
Gabriel Petersen · Utilities
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App info
- Developer
- Gabriel Petersen
- Category
- Utilities, Business
- Released
- Sep 30, 2026
- Version
- 1.0 (Oct 1, 2026)
- Price
- Free
- Size
- 1.7 MB
- Requires
- iOS 18.0
- Age rating
- 4+
- Languages
- English
In-app purchases
| Lifetime Pro | $4.99 |
Current prices, App Store US.
🔒 Price history4 snapshots: when prices changed and new plans appearedGet Pro access
About Water Heater Sizing Calculator
What size water heater do I need? Get a clear answer for tank and tankless water heaters in seconds, before you buy, quote or install. Water Heater Sizing Calculator turns real hot-water use into the numbers that matter: the minimum First Hour Rating (FHR) for a tank, and the flow in GPM at your temperature rise for a tankless unit. Basic sizing is free, with no account, no ads and no subscription. Built for plumbers, HVAC technicians, contractors, builders, property managers and homeowners who want a better answer than guessing by tank size. TANK WATER HEATER SIZING • Build your busiest hour from showers, faucets, tubs, dishwashers, clothes washers and more • See peak-hour hot-water demand in gallons • Get the minimum First Hour Rating to look for on the EnergyGuide label or spec sheet Two 50-gallon tanks can deliver very different amounts of hot water in an hour. First Hour Rating…
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