Buying guide
What Size Washing Machine Do You Need? Drum Capacity and Spin Speed
Matching the machine to your household. This guide covers drum capacity in kg by household size, what spin speed actually changes, and why a higher spin means less to dry and lower dryer bills.
Drum capacity, quoted in kilograms, is the weight of dry laundry a machine can wash in one full load, and you match it to your household: roughly 6–7kg suits a couple or small household, 8kg a typical family, and 9kg or more a large family or anyone washing bulky bedding. Spin speed, in rpm, is how fast the drum spins to extract water at the end – higher speeds (1400–1600rpm) leave clothes drier, which means less tumble drying and lower drying costs, though very high speeds can crease more. Buy the capacity that matches your normal loads, not the biggest available, and a spin speed of at least 1400rpm if you tumble dry.
The two numbers on a washing machine that actually matter to your laundry are the drum capacity, in kilograms, and the maximum spin speed, in rpm. Get the capacity right for your household and you wash efficiently; understand spin speed and you can cut what your dryer costs. This guide breaks both down so you can choose the right machine. Brennan's Electrical stocks a full range of washing machines with Click & Collect in Arklow and nationwide delivery.
Drum capacity, explained
Capacity is the maximum dry weight of a full load. Bigger is not automatically better: a large drum run half full wastes water and energy, while a drum that is too small means more cycles. Match it to the loads you actually do, with a little headroom for bedding and busy weeks.
Drum capacity by household
| Household | Suggested capacity |
|---|---|
| 1–2 people | 6–7 kg |
| Small family (3–4) | 8 kg |
| Large family (5+) | 9 kg or more |
| Bulky bedding / duvets | 9 kg+ regardless of household |
What spin speed changes
Spin speed is how fast the drum spins at the end of the cycle to fling water out of the clothes. The higher the rpm, the less water is left in the load – and that matters most for what happens next. Clothes spun at 1400 or 1600rpm come out much drier than at 1000rpm, so they need less time in the tumble dryer, which cuts your drying cost. The trade-off is that very high spins can crease clothes more and are firmer on delicates, which is why machines let you choose the speed per wash.
Spin speed and your drying bill
This is the link people miss. A tumble dryer's cost comes from removing water, so the drier your washing comes out of the machine, the less the dryer has to do. A higher spin speed is effectively free water removal – mechanical, not heated – so pairing a good spin with your dryer noticeably lowers drying time and cost. If you tumble dry, a maximum spin of at least 1400rpm is worth having.
- 1–2 people6–7kg drum: right-sized for a couple or small household.
- Small family (3–4)8kg drum: the standard fit for a typical family.
- Large family or bulky bedding9kg or more: handles duvets and heavy weekly wash loads.
Choosing the machine
- Pick the capacity for your normal laundry, not the biggest drum available.
- Choose a spin speed of 1400rpm or more if you tumble dry regularly.
- Check the energy rating to keep running costs down over the machine's life.
- Leave headroom for bedding and duvets rather than sizing to your smallest load.
- If space is tight, a washer dryer combines both in one footprint.
Where to buy a washing machine in Ireland
Brennan's Electrical stocks a full range of washing machines, so you can compare drum sizes and spin speeds and get honest advice on which suits your household. Order online with nationwide delivery, or use Click & Collect at our Arklow store, often the same day. As an independent Irish retailer, we are here to help you choose and to support you after you buy. Browse our washing machine range or visit us for a recommendation.
Frequently asked
What size washing machine do I need for a family?
Does a higher spin speed matter?
Is a bigger washing machine always better?
Find your size
Pick the capacity for your household, a spin speed of 1400rpm or more if you tumble dry, and a good energy rating to keep running costs down. If space is tight, a washer dryer combines both in one machine, and if drying costs matter most, see what a tumble dryer costs to run. For independent guidance on energy labels, see SEAI's guide to reading appliance energy labels.