Water Heater Calculator Pro

9 calculators + heater buying wizard to size, compare & optimize water heating.

Not sure which water heater to buy? Our built-in "Which Heater Should I Buy?" wizard walks you through 5 simple questions about your household and recommends the top 3 heater types with pros, cons, and estimated costs. No more guesswork.

Water Heating Calculators is the all-in-one water heater calculator and plumbing tool for homeowners, plumbers, engineers, and energy-conscious users.

KEY FEATURES

- Heating Energy Calculator: Find the exact energy (BTU/kWh) needed to heat water to your target temperature
- Heating Cost Calculator: Estimate daily, monthly, and yearly water heating costs for electric, gas, or heat pump systems
- Heating Time Calculator: Calculate how long your heater takes to reach the desired temperature
- Tank Size Calculator: Determine the right hot water tank size based on household size and usage patterns
- Heater Power Sizing: Find the correct wattage or BTU rating your water heater needs
- Heat Loss Calculator: Estimate standby heat loss from your tank based on insulation and ambient conditions
- Mixing Valve Calculator: Calculate the exact hot and cold water mix ratios for your desired output temperature
- Recovery Rate Calculator: Measure how quickly your tank reheats after heavy use
- Running Cost Comparison: Compare annual costs of electric vs gas vs heat pump water heaters side by side
- Heater Buying Wizard: Answer 5 questions, get personalized top 3 heater recommendations with pros, cons, and costs
- 30 Smart Presets: Quick-fill scenarios like "Fill Bathtub", "Family of 4", "Quick Shower" across all calculators
- Regional Energy Rates: Auto-fill electricity and gas rates for 30 countries worldwide

TOOLS & RESOURCES

- Calculation History: Save, review, and manage all past calculations with swipe-to-delete
- 15 Articles & Tips: Energy efficiency guides, heater maintenance, troubleshooting, seasonal tips, and more
- Professional Share: Export formatted results with all parameters for contractors and clients
- Unit Preferences: Switch between Celsius/Fahrenheit, Liters/Gallons, and 10 currency options
- Adjustable decimal places for precision calculations

WHY CHOOSE THIS APP

- Covers every water heating calculation in one app
- Smart presets eliminate manual data entry for common scenarios
- Regional energy rates mean accurate cost estimates for your location
- The heater buying wizard replaces hours of research with a simple 5-step questionnaire
- Clean, modern Material Design with dark mode support (System/Light/Dark)
- No account required, works completely offline

PERFECT FOR

- Homeowners sizing a new water heater or estimating energy bills
- Plumbers and HVAC technicians doing quick field calculations
- Engineers designing hot water systems for residential or commercial buildings
- Energy auditors comparing heater types and running costs
- Students learning thermodynamics and heat transfer concepts
- Anyone looking to reduce their water heating energy costs

Download now and take control of your water heating decisions with accurate calculations, smart recommendations, and expert tips.