About TanklessCalc

Size a tankless water heater by flow rate and temperature rise, and see what a unit really delivers in winter rather than the headline number on the box.

How this site is built

It is a static website. Every page is a pre-built file served from a content delivery network, and every calculation runs in your browser using JavaScript you can read. There is no account system, no server holding your inputs, and no paid API being called while you wait.

How it is funded

It is not funded; it costs almost nothing to run.

Contact: boldwebdevelopment@gmail.com.

Where the numbers come from

Published constants and standard formulas, described on each page next to the result they produce.

What this site does not do

• It does not collect your data, and has no way to.
• It does not give professional advice. See the disclaimer.
• It does not claim to be complete: where a question is out of scope, the page says so.

Independence

This site is not affiliated with, endorsed by, or connected to any government agency, standards body, manufacturer or retailer mentioned in its content. Errors are the operator's responsibility.