How Much Does It Cost to Run an Electric Outdoor Heater in NZ?
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TL;DR: A 2000W electric outdoor heater costs $0.70/hr at full power, based on NZ's current average electricity rate of $0.35/kWh (Canstar NZ, 2025). At half power (1000W), that drops to $0.35/hr. Over a typical NZ winter (90 evenings, 2 hours per night), full-power running cost is around $126. A gas mushroom heater running the same hours costs approximately $740 in LPG — nearly six times more.
The Running Cost Formula
Calculating the running cost of any electric heater uses the same straightforward formula — no guesswork required.
(Wattage ÷ 1000) × electricity rate ($/kWh) = cost per hour
For a 2000W heater at NZ's current average rate of $0.35/kWh:
(2000 ÷ 1000) × $0.35 = $0.70/hr
That is the number that matters. Everything else in this article applies that formula across different wattages, usage patterns, and regional electricity prices so you can see the full picture before buying.
To find your actual electricity rate, check your most recent power bill. The variable or unit rate will be listed in cents per kWh. If you are on a time-of-use plan, use your evening rate — that is when outdoor heaters are most commonly used.
NZ Electricity Rates in 2026
New Zealand's average residential electricity rate is approximately $0.35/kWh as of 2025, based on the national household average from Canstar NZ (using MBIE underlying data). This includes the variable unit rate and network charges as reflected in typical residential bills.
Most running cost guides for outdoor heaters still quote $0.28–$0.30/kWh — a figure that was accurate several years ago but now understates the real cost by 17% or more. Using the correct rate matters when comparing products and planning seasonal budgets.
The Commerce Commission has approved phased annual increases to electricity line charges through 2027. Electricity costs in NZ are trending upward — which makes running efficiency a more important purchase consideration now than it was even two years ago.
Regional rates vary meaningfully. See the regional breakdown below for how your location affects the calculation.
Running Cost per Hour: All Wattages
The table below shows the hourly running cost for the most common outdoor heater wattages at the NZ national average electricity rate, and at the high-end rate found in some West Coast and Northland areas.
| Heater Setting | Wattage | Cost/hr at $0.35/kWh | Cost/hr at $0.45/kWh (high-cost regions) |
|---|---|---|---|
| Half power (P1 mode) | 1,000W | $0.35 | $0.45 |
| ~⅔ power (F6 setting) | ~1,300W | $0.46 | $0.59 |
| Full power | 2,000W | $0.70 | $0.90 |
| Competitor — full power | 2,400W | $0.84 | $1.08 |
Based on NZ national average $0.35/kWh (Canstar NZ, 2025) and high-cost regional rate of $0.45/kWh observed in areas including parts of the West Coast and Northland.
The practical takeaway: a heater with nine adjustable power settings gives you meaningful cost control. Running at half power ($0.35/hr) instead of full power ($0.70/hr) halves your electricity cost with only a modest reduction in heat output — often enough for mild evenings or a smaller space.
Running Cost by Usage Pattern
How much you actually spend over a season depends entirely on how often you use the heater and at what power level. The table below covers the most common NZ residential usage patterns.
| Usage Pattern | Hours per Week | Weeks per Year | Annual Cost at $0.35/kWh (2000W full power) |
|---|---|---|---|
| Occasional (1–2 evenings/week) | 3 hrs | 20 weeks | ~$42 |
| Regular (3–4 evenings/week) | 7 hrs | 22 weeks | ~$108 |
| Heavy (daily, 2hrs/evening) | 14 hrs | 22 weeks | ~$216 |
| Year-round daily use | 14 hrs | 52 weeks | ~$510 |
Calculated at 2000W × $0.35/kWh. Reduce by approximately 50% if you predominantly use half power (1000W, P1 mode). NZ winter season estimated at 20–22 weeks (April–September).
For most NZ households, regular use over a 22-week winter season falls in the $100–$220 per year range at full power. At half power, that is more like $50–$110. These are running costs only — not the purchase price.
2000W vs 2400W: What Does the Extra Wattage Actually Cost?
The extra 400W costs $0.14 more per hour at the NZ average rate of $0.35/kWh. That is the full extent of the running cost difference between a 2000W and a 2400W electric outdoor heater.
| 2000W heater | 2400W heater | Difference | |
|---|---|---|---|
| Cost per hour | $0.70 | $0.84 | +$0.14/hr |
| Cost per week (14hrs) | $9.80 | $11.76 | +$1.96/week |
| Cost per season (22 weeks) | $215.60 | $258.72 | +$43/season |
Over a full NZ winter, the running cost difference between 2000W and 2400W is approximately $43 — less than some buyers might expect. The bigger cost question is not the $0.14/hr gap but whether the extra wattage delivers meaningfully more warmth.
The answer is: not necessarily. Wattage measures electrical input, not felt warmth delivered to people. A 2000W carbon fibre infrared element converts electricity to radiant heat more efficiently than a 2400W quartz element. The felt warmth difference in a typical covered NZ deck or pergola is minimal — because carbon fibre emits at a wavelength more readily absorbed by skin and surfaces, wasting less energy as visible light.
Where higher wattage does make a real difference: uncovered decks larger than 20m², exposed to persistent strong wind. For the standard 10–16m² covered outdoor space, 2000W carbon fibre is the more economical and equally effective choice.
For a full technical breakdown, see Does a 2400W Heater Actually Heat Better Than 2000W?
Electric vs Gas: Full Season Cost Comparison
The running cost advantage of electric infrared over gas is substantial — especially when calculated over a full NZ winter season rather than just per hour.
A typical 12kW LPG gas mushroom heater consumes approximately 1kg of LPG per hour at full power. At $37 for a 9kg bottle (LPG4U, Feb 2026), that works out to approximately $4.11/hr.
| Heater Type | Cost per Hour | Cost per Week (14hrs) | Cost per Season (22 weeks) |
|---|---|---|---|
| Electric 2000W — half power | $0.35 | $4.90 | $107.80 |
| Electric 2000W — full power | $0.70 | $9.80 | $215.60 |
| Electric 2400W — full power | $0.84 | $11.76 | $258.72 |
| Gas 12kW mushroom — full power | $4.11 | $57.54 | $1,265.88 |
Gas cost calculated at $37/9kg (LPG4U, Feb 2026), 1kg/hr consumption. Electric costs at $0.35/kWh (Canstar NZ, 2025).
Running a gas mushroom heater at full power for a 22-week NZ winter costs over $1,200 in fuel. The electric alternative at full power costs around $216 — a saving of over $1,000 per season. Even accounting for the higher upfront cost of a quality electric heater, the payback period is typically one to two winters.
There is also the practical cost of gas bottle management: purchasing, transporting, storing, and swapping bottles. A gas heater that runs out mid-evening in June is not a minor inconvenience.
Electric infrared also produces no CO₂ and generates 85% less carbon on NZ's renewable-heavy grid — making the running cost advantage align with the environmental one.
How to Reduce Your Running Costs
A quality electric outdoor heater with the right features gives you several levers to bring running costs down without sacrificing comfort.
Use Lower Power Settings
A heater with nine adjustable settings (F1–F9) lets you match output to conditions precisely. On a mild evening in early autumn, F4 or F5 (~800–1,000W) is often enough — costing $0.28–$0.35/hr instead of $0.70/hr. A heater with only two or four settings forces you toward full power more often.
Use the Timer
Set the heater to switch off automatically at the end of the evening. A 24-hour timer prevents the heater from running unattended after guests leave — which is both a safety measure and a cost one. Even an extra 30 minutes of unnecessary running adds up over a season.
Choose a Sheltered Installation Position
Infrared heats people and objects, not air — so wind doesn't carry away the warmth. But a poorly positioned heater (aimed away from the seating area, or mounted too high) wastes effective output. Mounting at the correct height (1.8–2.2m from floor, angled toward the seating zone) maximises felt warmth per watt consumed.
Half Power Mode
Most quality infrared heaters offer a half-power mode (P1 on the Zuna — approximately 1000W). For social evenings with movement and activity, half power is often sufficient. Running at 1000W instead of 2000W halves the hourly cost with only a modest reduction in output.
Running Cost by NZ Region
NZ electricity prices vary by network region. The table below uses representative all-in rates based on current national data.
| Region | Approx. Rate | 2000W Full Power Cost/hr | 22-Week Season Cost |
|---|---|---|---|
| Auckland | ~$0.36/kWh | ~$0.72 | ~$222 |
| Wellington | ~$0.34/kWh | ~$0.68 | ~$210 |
| Canterbury (Christchurch) | ~$0.35/kWh | ~$0.70 | ~$216 |
| Otago (Dunedin) | ~$0.36/kWh | ~$0.72 | ~$222 |
| West Coast (Greymouth/Westport) | ~$0.47/kWh | ~$0.94 | ~$290 |
| Northland (Kerikeri area) | ~$0.44/kWh | ~$0.88 | ~$272 |
Regional rates are indicative estimates based on Canstar NZ regional data (2025). Your actual rate will depend on retailer and plan. Check your power bill or Powerswitch for the most accurate figure.
For West Coast and Northland households, where electricity is most expensive, running efficiency matters more than anywhere else in the country. A heater with more granular power settings — and a carbon fibre element that delivers more warmth per watt — has a higher relative value in these regions.
FAQ
How much does it cost to run an electric outdoor heater in NZ?
At the national average of $0.35/kWh (Canstar NZ, 2025), a 2000W electric outdoor heater costs $0.70/hr at full power or $0.35/hr at half power (1000W). Over a 22-week NZ winter at 2 hours per evening, full-power running cost is approximately $216. Use lower settings for mild evenings to reduce this significantly.
Is a 2400W outdoor heater more expensive to run than 2000W?
Yes, by $0.14/hr at current NZ rates — $0.84/hr vs $0.70/hr. Over a full winter season of daily use that adds approximately $43. The more important question is whether a 2400W heater is actually warmer. A 2000W carbon fibre element typically delivers comparable felt warmth to a 2400W quartz model because of higher conversion efficiency. See Does a 2400W Heater Actually Heat Better Than 2000W?
How much cheaper is an electric heater to run than gas in NZ?
Approximately six times cheaper per hour. A 2000W electric infrared heater costs $0.70/hr; a 12kW gas mushroom heater costs $4.11/hr (based on a 9kg LPG bottle at $37, LPG4U, Feb 2026). Over a 22-week NZ winter season, that difference exceeds $1,000.
How do I calculate my outdoor heater running cost?
Formula: (Wattage ÷ 1000) × electricity rate = cost per hour. For a 2000W heater at $0.35/kWh: (2000 ÷ 1000) × 0.35 = $0.70/hr. Find your actual electricity rate on your power bill under "variable rate" or "unit rate" — listed in cents per kWh.
How can I reduce my outdoor heater running costs?
Use lower power settings for milder evenings (a heater with nine settings can run at $0.35/hr instead of $0.70/hr). Use the timer to avoid running it unattended. Mount the heater correctly so output is directed at the seating area rather than wasted. Choose a carbon fibre element — it delivers more felt warmth per watt than quartz or halogen.
What is the average electricity rate in NZ in 2026?
Approximately $0.35/kWh nationally (Canstar NZ, 2025). Regional rates range from around $0.34/kWh in Wellington to $0.47/kWh on the West Coast. The Commerce Commission has approved line charge increases through 2027, so rates are likely to continue rising.
Conclusion
Running cost electric outdoor heater NZ calculations are straightforward once you have the right electricity rate. At $0.35/kWh, a 2000W heater costs $0.70/hr at full power — or around $216 over a full NZ winter of daily evening use. The difference between 2000W and 2400W is just $43 per season. Gas costs over $1,000 per season for the same usage.
The variables that matter most: your regional electricity rate, how often you use the heater, and whether you take advantage of lower power settings for milder evenings. A heater with nine adjustable settings gives you genuine control over all three.