See Your Tankless Water Heater Savings

The figures above come from published Energy.gov comparisons of tankless (on-demand) and storage-tank water heaters. Your annual savings = (monthly gas bill × 12 × 27%) + (monthly electric bill × 12 × 4%), adjusted for your household size and home square footage. The 10-year figure nets out a typical 3-year equipment amortisation so the number is defensible when you compare it to a contractor quote.

• Tankless water heaters reduce gas water-heating usage by ~27%.
• Removing a tank cuts idle/standby electric losses by ~4%.
• Household size scales the model: small households under-utilise a storage tank; large households benefit most from on-demand heating.
• Larger homes lose more heat in longer recirc runs — so we apply a small sqft penalty above a 1,500 sqft baseline.
• The 10-year figure is net of equipment payback — your real out-of-pocket savings across a decade.