The household appliances that last for decades – and the ones you should always upgrade

Smaller or simpler items tend to be more variable, and how often they’re used, how they’re maintained and whether spare parts are easily available all affect longevity.

Some product categories have changed very little in core function over the years. For these, newer models may offer extra bells and whistles but not fundamentally better performance.

Irons, basic microwaves and food mixers fall into this group. These appliances rely on straightforward heating or mechanical components and tend to have fewer electronic parts that can fail.

Consumer NZ spokesperson Bryan Wall says longevity often comes down to what happens after purchase.

“Appliances that last longer usually have strong repair networks behind them. That includes access to spare parts and technicians with brand-specific knowledge.”

Owner behaviour matters too.

“If a consumer is happy with the performance, function and look of a product, they’re more likely to maintain and service it, extending its lifespan. It’s very much like a prized car that’s looked after by its satisfied owner.”

Other relatively low-tech appliances such as kettles, toasters and stand mixers also fit this pattern. While newer versions may offer digital displays or cosmetic changes, the core function hasn’t changed enough to justify replacing a working older model in many cases.

Other categories have seen real improvements in efficiency, performance and everyday usability.

Washing machines are a clear example.

“Many newer washing machines now include smart functionality that reminds you when servicing or cleaning is required, or alerts you to faults – sometimes even via an app,” Wall says.

Dishwashers have also improved significantly over recent years, with better water efficiency, quieter operation and more effective drying than many older models. Meanwhile, modern vacuum cleaners offer stronger suction, improved filtration and better performance on pet hair and hard floors compared with older units.

These upgrades aren’t just about flashy features – they can reduce running costs, improve results and make everyday chores quicker and easier.

That said, not every “smart” feature is worth paying for.

“There seems to be an abundance of new smart functionality added to appliances,” Wall says. “You might feel like you’re missing out, but do you really need a smart dustbin, cooktop or fridge? Often, smart functions are a waste of time.”

Some appliances are affected not by mechanical wear but by software and support obsolescence. Consumer NZ has noted that appliances with connected or app-based features can age faster in terms of usability when software support ends or compatibility changes, even if the hardware remains sound. This is an added reason to be cautious about over-valuing “smart” upgrades that may not be supported long term.

Before writing off an appliance, Consumer NZ recommends a pragmatic checklist.

“Start by thinking about how long you’ve had the appliance and realistically how much longer it may last,” Wall says. Ask yourself if other components are likely to fail soon.

Then check costs and logistics.

“Talk to spare parts suppliers and service centres for estimates. If parts aren’t available in New Zealand, what’s the lead time? If a washing machine part is going to take four months to arrive, you’ll need another way to wash clothes in the meantime.”

Efficiency should also factor into your decision.

“Consider whether newer models are significantly more efficient or perform much better. If the improvement is substantial, it may not be worth keeping the old one.”

And don’t ignore the environmental cost of sending a still-functional appliance to landfill.

Many Kiwis assume that once an appliance is outside its manufacturer’s warranty, there’s no recourse when it fails. That’s not the case.

“The Consumer Guarantees Act doesn’t currently stipulate an expected lifespan for product types,” Wall says. “People don’t realise that an appliance that fails just outside the two-year manufacturer’s warranty may still be covered under the CGA.”

Warranties are often more convenient because they shift the burden of proof, but they’re not the only protection you have.

“Don’t assume a higher price means best quality,” Wall says. “Our product tests often find that cheaper brands can outperform the expensive ones.”

What matters more is long-term support.

“Any manufacturer who supports their products with readily available spare parts and service documentation is going to have products that last longer,” he says.

Not all appliances benefit from constant upgrading. Knowing which category your appliance falls into can save money, reduce waste and help Kiwi households make smarter replacement decisions.

(Estimates vary by brand, usage and maintenance, but these are typical ranges cited by Consumer NZ and related NZ research.)

Herald contributor Nikki Birrell has worked in food and travel publishing for nearly 20 years. From managing your kitchen to cutting costs, she’s shared some helpful advice recently, including how to prep your barbecue for summer grilling, gourmet hacks for elevating budget ingredients and what toppings to choose for different crackers.