Sizing Tankless Water Heaters - Bradley Corporation

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.

Click to enlarge

Groundwater Temperature

How cold is the water coming in?

°F

Usage Temperature

How hot do you want the water?

°F

Flow Rate

How much water are you using?

GPM

Power
Required

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.

Tankless Heating Systems

On-Demand Heater
On-Demand Heater w/ Recirculation
Parallel On-Demand Heaters *
Pre/Post Heating R/O System

Mixed Systems

On-Demand Water Heater With Hot Water Storage Tank
On-Demand Heater With Buffer Tank
Solar Water Heating System & Tankless Booster
Geothermal Heating System & Tankless Booster

Recommended
Keltech Unit Size

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.