Hot Water Calculator

Calculate and compare hot water heating costs for different systems. Find the most economical solution for your water heating needs.

Hot Water Cost Calculator

Compare different water heating systems and find savings

Usage Details

Recommended: 150L for 3 people

Energy Prices & Settings

Hot Water System Technologies

Understanding different water heating technologies and their efficiency

Electric Systems

95% efficiency, instant hot water, higher running costs but lower installation cost

Gas Systems

85% efficiency, lower fuel costs, requires gas connection and flue

Heat Pumps

300% efficiency, very low running costs, higher installation cost

Solar Thermal

Free energy from sun, 60% coverage typical, requires backup system

Combi Boilers

88% efficiency, combined heating and hot water, space-saving solution

Hybrid Systems

Combine multiple technologies for optimal efficiency and reliability

Hot Water Saving Tips

Simple changes that can reduce your hot water costs significantly

💡

Lower Temperature

Reduce water heating temperature by 5°C to save 10-15% on costs

🚿

Shorter Showers

Reduce shower time by 2 minutes to save 25% on hot water usage

🔧

Fix Leaks

A dripping hot water tap can waste $35-50 per year in energy

  1. 1

    Estimate Daily Usage

    Calculate hot water needs: 15-20 gallons per person/day, plus dishwasher (6-10 gal/load) and washing machine (15-30 gal/load). Average household: 60-80 gallons/day. Track actual usage for 1 week for accuracy.

  2. 2

    Check Current Heater Type

    Identify existing water heater: tank (50-70% efficient), tankless (80-95%), heat pump (200-300%), or solar (50-80% free). Check age - if 10+ years old, consider replacement for efficiency gains.

  3. 3

    Input Energy Rate

    Enter electricity or gas price per unit from utility bill. Water heating typically costs $200-600/year. Higher rates make efficient heaters more cost-effective.

  4. 4

    Select New Heater Type

    Compare options: Tank ($400-900, 6-12 year life), tankless ($1,000-3,000, 20+ years), heat pump ($1,200-2,500, 10-15 years), solar ($5,000-8,000, 20+ years). Consider: household size, budget, and efficiency goals.

  5. 5

    Review Savings and Payback

    Calculator shows annual operating cost for each heater type, upgrade cost, and payback period. Consider total lifetime cost (purchase + installation + 20 years energy). Don't forget to factor in available rebates ($300-1,000).

Pro Tip: Use Ctrl+Enter to calculate quickly, or Ctrl+R to reset the form.

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