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Water Heaters

Tank and tankless sizing, recirculation and the trade-offs between fuel types.

Calculators

Water Heater Sizing Calculator: First-Hour Rating from Peak Hour UseTank water heaters should be sized by first-hour rating (FHR), the gallons of hot water they can deliver in one busy hou…

Guides

Hot Water Recirculation Pumps: Types, Controls and Energy Trade-OffsA recirculation pump keeps hot water near your fixtures so it arrives in seconds instead of minutes. Dedicated return lo…Tankless vs Tank Water Heater: Cost, Efficiency and Sizing ComparedTankless heaters avoid standby losses, last longer and never run out, but they cost more to install, are limited by flow…