Sizing Calculator for Tankless Water Heaters

If you know your usage temperature, incoming temperature, and flow rate, this handy sizing guide spreadsheet can help you find your power requirements and suggest a Keltech tankless water heater model for you.

Groundwater Temperature
How cold is the water coming in?
°F
Thermometer
Usage Temperature
How hot do you want the water?
°F
Faucet
Flow Rate
How much water are you using?
GPM
Equal Sign
Power
Required

kW
Arrow

Plumbing Diagrams

We offer these layouts as examples of common plumbing systems with tankless water heaters.
These things use high voltage to make hot water, have a plumbing engineer look at any layout before installation.

If you have an uncommon application, we offer Design On Demand help.

* Parallel installation of heaters evenly distributes workload and wear. Serial installation puts the majority of stress and workload on the first heater in a sequence.

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