BP Gas Bottle Swap Price NZ Today: Comparison of Swap Costs

If you’ve ever had your BBQ gas bottle run out mid-cook, you know the scramble for a swap or refill. The cost of swapping a 9kg LPG bottle varies more than you’d think, ranging from $42 to $52 depending on the retailer.

Typical 9kg swap cost: $42–$52 ·
Z Energy swap price: similar to industry average ·
Refill vs swap difference: $3–$8 per bottle ·
Cheapest reported refill: from $16 (KiwiGas) ·
Standard bottle size: 9 kg

The table below summarises the key facts from available data.

How much to swap a gas bottle in NZ?

The cost of swapping a standard 9kg LPG bottle across New Zealand retailers is not always posted online. Based on user reports on Reddit, a typical swap runs between $42 and $52 (Reddit r/auckland (community forum)). Z Energy offers a swap service at its stations, though the exact price isn’t listed on its site – the process is described as “fast, safe and simple” and includes a full safety inspection of the replacement bottle (Z Energy (official NZ fuel retailer)).

Current swap prices at BP and Z

• BP: No official price published online; user reports suggest BP prices are in line with the $42–$52 range.
• Z Energy: Swap service confirmed; price not disclosed but assumed competitive with other swap providers.

Cost for 9kg bottle swap today

For a 9kg bottle, the swap cost typically falls in the mid-$40s. A Wellington-based Reddit user noted a swap was only about $3 cheaper than a refill at one station (Reddit r/Wellington (community forum)). This suggests the price gap is narrow, making location and convenience the deciding factors.

Where to find the best price near you

Because most retailers don’t publish real-time prices, the best strategy is to call ahead. KiwiGas advertises refill prices starting from $16 (fixed until 2026) (KiwiGas (NZ gas retailer)), which is considerably cheaper than swapping – but refilling requires a bottle in good condition and a filling station nearby.

Bottom line: Gas bottle swap prices in NZ hover around $42–$52 for 9kg. If you want convenience and safety, swapping wins. If you’re pinching pennies, refilling can cut your cost by $3–$8 per bottle.

The implication: The narrow gap between swap and refill prices means convenience often wins.

How much is the 9kg bottle swap?

The 9kg bottle is the standard size for home BBQs and patio heaters. Here’s what it costs at the main swap providers in New Zealand.

9kg swap price at Z

Z Energy’s swap service is widely available, but the company does not publish a fixed price. User reports indicate the cost is around $48, in line with the broader market (Reddit r/auckland (community forum)).

9kg swap at ELGAS and other suppliers

• ELGAS SWAP n GO: Available for 9kg bottles; prices vary by location (ELGAS NZ (LPG supplier)). Their Australian affiliate reports 8.5kg refill prices in the “upper $20s to mid $40s” (ELGAS Australia (LPG supplier)).
• KiwiGas: No swap price listed, but refill starts at $16 (KiwiGas (NZ gas retailer)).
• Challenge Fuel: Offers LPG swaps at select stations (Challenge Fuel (NZ convenience chain)).
• Coregas Trade N Go: For home applications; contact local store for quote (Coregas NZ (industrial gas supplier)).

Bottom line: The 9kg swap price at most NZ retailers is effectively the same – around $48. ELGAS and independent gas suppliers may offer slight variations, but the difference is usually only a few dollars.

The pattern: Swap prices converge around the same point across most retailers.

How much is a large swap and go gas bottle?

The “large” swap-and-go bottles in New Zealand are typically 8.5 kg or 9 kg. ELGAS markets its SWAP n GO in 9kg size (ELGAS NZ (LPG supplier)). Coregas offers Trade N Go for BBQs, with pricing available at the point of sale (Coregas NZ (industrial gas supplier)). What this means: The 8.5-9kg size is the standard, and pricing does not penalise larger bottles.

Is it cheaper to fill a gas bottle or swap it?

Several factors tip the scale: refilling costs less per bottle, but swapping saves time and guarantees a tested cylinder.

Refill vs swap cost difference

User reports indicate refilling a 9kg bottle can be $3 to $8 cheaper than swapping it. A Geekzone forum user reported paying $24.95 to fill a 9kg bottle (Geekzone (tech forum)), and a Tripadvisor discussion from 2014 mentioned refill prices of $25–$35 (Tripadvisor (travel forum)). Meanwhile, swap costs cluster around $48.

Long-term savings analysis

If you swap every bottle, you could pay $24–$64 more per year (assuming 8 swaps). However, if your bottle is old or damaged, swapping is safer because the provider inspects and fills the replacement.

Bottom line: Refilling is consistently cheaper for 9kg LPG. But for those who value convenience and safety, the swap premium is small enough to ignore.

The catch: Even with a $3-$8 saving, refilling requires a bottle that passes inspection.

Who is the cheapest gas supplier in NZ?

Based on available data, KiwiGas offers the lowest refill price at $16 (KiwiGas (NZ gas retailer)), but that’s for refilling, not swapping. For swap services, prices are very similar across all retailers – typically $42–$52. The real savings come from choosing refill over swap.

BP vs Z vs ELGAS vs others

The following table compares swap and refill prices across major suppliers.

Bottom line: For swap convenience, prices are essentially the same across major providers. If you want the lowest possible cost, find a KiwiGas refill station – $16 is the best deal in NZ today.

The pattern: KiwiGas stands alone as the cheapest refill option, but swap prices are uniform.

What the numbers really mean

What users are saying

“Swap cost at Z and BP is about $48 – refill was $35 at a station in Auckland.”

Reddit r/auckland (Reddit r/auckland (community forum))

“In Wellington I swapped for $44 – only $3 more than filling. Convenience won that day.”

Reddit r/Wellington (Reddit r/Wellington (community forum))

For New Zealand households that rely on LPG for BBQs, patio heaters, or camping, the choice between swap and refill comes down to a simple trade-off: pay a few dollars more for the convenience and safety of a swap, or save money by refilling at a station that offers the service. With KiwiGas offering refills from $16, the smartest move for budget-conscious users is to locate a refill-friendly retailer and keep an eye on bottle condition. For everyone else, the swap-and-go model at Z, BP, or ELGAS works just fine – at a price that’s unlikely to surprise you.

For a broader look at gas bottle swap prices across different suppliers, the Southern Scope guide offers a useful comparison.

Frequently asked questions