Engineering data for HVAC sizing, efficiency & troubleshooting
AboutContact
HVAC SolverTechnical Reference
CalculatorsTroubleshootingEfficiencyInstallation
  1. Home
  2. /
  3. Water Heaters

Water Heaters

Tank and tankless water heater guides

3 articles

Calculators

Water Heater Sizing Calculator

This is one of the most common water heater questions we get — and the answer is almost never "just buy a bigger tank." The real answer depends on your ...

Guides & References

Hot Water Recirculation Pumps

We hear this all the time. The average person waits approximately 2 minutes for hot water to arrive at the faucet (Grundfos). All that cold water runnin...

Tankless vs Tank Water Heater

We hear this one constantly. Your old tank finally gives out, the plumber shows up with a quote, and suddenly you're staring at a $3,000+ price tag for ...

HVAC Solver

Free technical resources for HVAC system sizing, efficiency analysis, and troubleshooting. All calculators and reference data are based on ASHRAE standards, DOE methodology, and EPA guidelines.

Calculators

  • AC Tonnage Calculator
  • Heating BTU Calculator
  • CFM Calculator
  • Generator Sizing
  • Water Heater Sizing

Reference Guides

  • SEER Rating Guide
  • Thermostat Wiring
  • Refrigerant PT Charts
  • R-Value Chart
  • MERV Rating Chart

Topics

  • All Calculators
  • Troubleshooting
  • Efficiency Guides
  • Installation Guides
  • Energy Costs
  • Refrigerants
  • Indoor Climate
  • Water Heaters

Information

  • About
  • Contact
  • Privacy Policy
  • Terms of Use

General Inquiries

info@hvacsolver.com

© 2026 HVAC Solver. All rights reserved.

Calculator results are estimates for educational purposes. Consult a licensed HVAC professional for system sizing.