Checklist

If you're in the market for a dryer here's what to consider.

Size
The normal size for a clothes dryer is 4.5 - 5 kilograms, which corresponds to a 5 - 5.5 kg size washing machine. Unless you've got space constraints in your laundry area or don't have big loads, avoid the small 3.5kg models. They tend to be less energy efficient.

Size for size, with vented sensor/timer models, there's not a huge difference in running costs. Expect to pay 70 to 75c for a 3.5kg load, between 90 and 95c for a 5kg load and around $1.10 for a 6kg load. We recommend you buy a 2-star model (at minimum), to keep the costs down.

If you need to dry big loads of washing quickly, a large style clothes dryer (as pictured) is the answer. The bad news is that these big models are expensive, and you'll most likely have extra costs to install the high capacity 20 amp wiring they require. They're also very big, and can't be wall-mounted or stacked on a front-loading washing machine.

Despite being high powered, they're only slightly less energy efficient than smaller models.

Sensor-and-timer or timer-only?

A sensor decides when the clothes are dry enough and then turns the dryer off. Models with a sensor usually have a timer as well, so you have more flexibility. But sensor-and-timer models tend to be more expensive. Think about how often you'll use the sensor: there's no point paying for sensor drying if you use it only occasionally.

Ducting

Clothes dryers generate lots of warm moist air - and a model that can be ducted outside is preferable. Ducting to the outside prevents dripping walls and mouldy ceilings.

Filter position

Clothes dryers produce lint, which is collected in a filter.

Lint build up reduces drying efficiency and can cause overheating, so an easy to reach filter is important for regular cleaning. Filters mounted at the back of the drum are harder to reach for cleaning. This means you might be tempted to skip this task rather than cleaning the filter regularly.

Check ducts from time to time for dust and lint build up, which also lowers efficiency and can become a fire hazard.

Reverse tumbling

This feature can help prevent clothes tangling and creasing.

Wall mounting or stackable

You'll save space if your dryer can be mounted on the wall or stacked on top of a front-loading washing machine.

Stackable models are usually designed to be mounted on top of front-loading washing machine from the same brand. If you want to stack your dryer, check on this before you buy it.

Drying racks

These are used for drying shoes and other non-fabric items. Racks are usually an optional extra, available in internal and external types. External racks only work with non-ducted models with an exhaust grille in the front door.

Drying time

This varies widely between models, and depends on the capacity of the machine, and the weight of clothes being dried. The quickest 5kg models can dry a load of clothes in about 2 hours. Slower models can take up to 40 minutes longer.

Automatic restart

Some dryers automatically restart if the door is opened and then closed mid-cycle. It's better for child safety if the dryer has to be restarted manually.

Energy efficiency

Can a dryer be energy efficient? The answer is no - at least not if it's a conventional warm-air-blowing model. Heating air and blowing it through the dryer is costly - almost a dollar a load on the big 6kg models.

Some (but not all) condenser dryers are more energy efficient than conventional models. Heat-pump dryers are extremely energy efficient, but they're very expensive to buy.

Use a clothesline as much as you can. There are no running costs - apart from replacing the pegs now and then! Use your washing machine's fastest spin-speed when that load's going into the dryer. The more water you spin out, the less power you use.

Buying second-hand

A clothes dryer is a basic appliance and you can buy one cheaply second-hand. Here's our advice:

• Buy only if the dryer looks tidy and well cared for. Stick to well-known brands.
• Check that the door opens and shuts properly.
• Under the Electricity Act, all electrical appliances for sale must be safe - whether they're new or second-hand, bought privately or from a dealer.
• If you buy from a second-hand dealer and then discover the dryer's faulty, you're covered by the Consumer Guarantees Act. If you buy privately, you're not.