Efficient Appliance Replacement
Calculator
Results
- Break-even (years)
- 7.773236 yr
- Net position at the horizon
- $531.08
- Total savings
- $1,351.08
- First-year saving
- $95.20
- Energy saved per year (kWh)
- 340 kwh
- Net upfront cost
- $820.00
Cumulative cash flow crossing zero at break-even
- Cumulative cash flow
- Cumulative cost of doing nothing
- Cumulative cost with the upgrade
Year-by-year cash flow until break-even
| 1 | 95.20 | 95.20 | -724.80 | 145.60 | 870.40 |
| 2 | 98.06 | 193.26 | -626.74 | 295.57 | 922.31 |
| 3 | 101.00 | 294.25 | -525.75 | 450.04 | 975.78 |
| 4 | 104.03 | 398.28 | -421.72 | 609.14 | 1,030.85 |
| 5 | 107.15 | 505.43 | -314.57 | 773.01 | 1,087.58 |
| 6 | 110.36 | 615.79 | -204.21 | 941.80 | 1,146.01 |
| 7 | 113.67 | 729.47 | -90.53 | 1,115.65 | 1,206.19 |
| 8 | 117.08 | 846.55 | 26.55 | 1,294.72 | 1,268.17 |
| 9 | 120.60 | 967.15 | 147.15 | 1,479.17 | 1,332.02 |
| 10 | 124.21 | 1,091.36 | 271.36 | 1,669.14 | 1,397.78 |
| 11 | 127.94 | 1,219.30 | 399.30 | 1,864.82 | 1,465.51 |
| 12 | 131.78 | 1,351.08 | 531.08 | 2,066.36 | 1,535.28 |
Comparison
| Scenario | Total cost over the horizon | Cumulative energy cost | Net position at the horizon |
|---|---|---|---|
| Do nothing | 2,066.36 | 2,066.36 | 0.00 |
| With the upgrade | 1,535.28 | 1,535.28 | 531.08 |
Formula
saving(n) = (kWh_old − kWh_new) × price × (1+g)^(n−1)= 7.77
Note
This is a simplified cash-flow model. It projects the prices, escalation rate and equipment costs you entered with a single geometric escalation and no discounting, no inflation adjustment, no financing costs and no tax treatment; savings are assumed to accrue evenly within each year, which is what the fractional break-even interpolates. Real energy prices, tariff structures, grants, weather, occupancy and equipment performance vary widely and change over time. A break-even of zero means the cumulative cash flow never crosses into positive territory within the horizon you chose. Get a professional energy assessment and a written quotation before committing to any of these measures.
More in Energy payback
See all →Frequently asked questions
How does the calculator compare an old appliance to a new efficient one fairly?+
It compares the annual energy cost of running your current appliance (based on its age, type, and estimated wattage or kWh/year) against the energy cost of a new ENERGY STAR or high-efficiency model, then divides the price difference (or full price, if your old one is being replaced anyway) by the annual savings. The key input is your old appliance's actual energy use, which is often higher than its original nameplate rating due to age-related efficiency loss.
Should I use the full price of the new appliance or just the price difference?+
Use just the price premium over a standard (non-efficient) replacement if your old appliance is failing and needs replacing regardless — you're already committed to that base cost, so only the extra spent on efficiency should be measured against the extra savings. Use the full price only if you're replacing a still-functional appliance purely to save energy, since then the whole purchase is optional.
Why do refrigerators and water heaters show faster paybacks than dishwashers or washers?+
Refrigerators and water heaters run continuously or very frequently and consume energy directly for their core function (cooling or heating), so efficiency gains apply to nearly all their runtime. Dishwashers and clothes washers use energy intermittently and a large share of their improvement often comes from water efficiency rather than electricity, which shows up as a smaller dollar saving on a typical utility bill.
Does appliance age matter beyond just 'old equals inefficient'?+
Yes — efficiency standards tightened substantially at specific points (for example, refrigerators sold before 2001 typically use 2-3x the energy of current models), so an appliance's manufacture year relative to those standard changes matters more than age alone. A 15-year-old high-efficiency model may still beat a 5-year-old base-standard one.
What if my old appliance isn't broken — is replacing it still worth it?+
Only if the payback period is comfortably shorter than the remaining years you'd otherwise keep the old unit, since scrapping a working appliance also has an embodied-carbon and disposal cost the payback number doesn't capture. For appliances with long remaining service life and modest efficiency gaps, waiting until natural failure is usually the more sensible choice both financially and environmentally.