Terms of Use

License

Water Heater Sizing Calculator is licensed to you under Apple's Licensed Application End User License Agreement (the standard EULA). These terms add information specific to this app and do not replace that agreement.

Estimates, not equipment selection

The app calculates performance requirements from the values you enter and the stated assumptions. It does not select equipment, size electrical or gas supply, or check code compliance. Results depend on your inputs, and real-world performance varies by model, fuel, temperature rise and installation.

Always verify the final equipment choice against manufacturer specifications, installation instructions, applicable codes and local requirements, and consult a qualified professional where required.

Lifetime Pro

Lifetime Pro is a one-time, non-consumable in-app purchase. It is not a subscription and does not renew. Purchases are processed by Apple and are subject to Apple's terms, including its refund policy. Restore a purchase from Settings → Restore Purchases in the app while signed in with the same Apple Account.

Basic tank and tankless sizing remains free.

Privacy

The app does not collect personal data. See the privacy policy.

Changes and contact

If these terms change, this page will be updated with a new effective date. Questions go to the address on the support page.