An automatic dispenser is more hygienic and uses less soap per wash. A manual one has nothing to go flat, nothing to fail, and costs less to buy. Which is right depends almost entirely on how busy the washroom is and who maintains it.
This guide covers the real differences — capacity, refill cost, battery life, mounting — so you can size a dispenser to the room rather than to the brochure.
The honest comparison
Manual dispensers use a push button or a lever. The user presses, soap comes out, and the dose is whatever they press out of it. There is no power, no sensor and no circuit board, which means there is very little that can break. A knocked or over-pressed manual unit can drip, and the button is a shared touch point.
Automatic dispensers use an infrared sensor to detect a hand and release a measured dose. Nothing is touched, the dose is consistent, and soap consumption typically drops because users cannot pump three times out of habit. They need batteries or a power supply, the sensor can be triggered by a passing sleeve, and there is more to go wrong.
The decision usually comes down to three things:
- Traffic. Above roughly 100 washes a day, the soap saved by a measured dose starts to matter.
- Who refills it. If there is a cleaner on a schedule, automatic is fine. If it is refilled when someone notices it is empty, a large-capacity manual unit is more forgiving.
- The hygiene expectation of the setting. Food handling, medical and childcare settings have a strong case for touch-free at the basin.
Size the capacity to the traffic
The most common mistake is buying a dispenser that is too small and then refilling it constantly.
A single hand wash uses roughly 1 to 2ml of liquid soap, or less with a foaming unit. That gives a rough guide:
| Capacity | Approximate washes per fill | Suits |
|---|---|---|
| 200 to 300ml | 150 to 300 | Home bathroom, small office, single cubicle |
| 500ml | 250 to 500 | Café, small clinic, staff kitchen |
| 800 to 1000ml | 500 to 1000 | Restaurant, school, gym, busy office |
| 1000ml plus, or recessed | 1000 and over | Shopping centre, stadium, hospital, factory |
A 300ml wall-mounted unit suits a quiet washroom or a second basin. For anywhere with steady traffic, a 1000ml stainless steel dispenser halves the number of visits a cleaner has to make.
If a washroom has two basins, two smaller dispensers beat one large one in the middle — people queue at the basin, not at the soap.
Foam or liquid
Foaming dispensers whip air into the soap before it leaves the nozzle. That has three practical effects.
- It uses less soap. A foam dose spreads further, so the same volume of concentrate lasts longer.
- It rinses faster, which shortens the whole wash and matters in a busy washroom.
- It needs foaming soap. Standard liquid hand soap in a foaming unit will block the pump. This is the single most common reason a foam dispenser stops working, and it is avoidable.
If different people buy the consumables and maintain the dispensers, label the unit. A foam dispenser filled with the wrong soap is a fault report waiting to happen.
Batteries, sensors and the things that fail
If you choose automatic, plan for the battery.
Most units run on standard alkaline cells and last months rather than weeks, but they do not fail politely — they usually slow down before they stop, so the complaint arrives as "the soap is weak" rather than "the battery is flat". Two habits prevent that: change the batteries on a schedule rather than on failure, and keep a spare set in the cleaner's cupboard.
Other things worth knowing:
- Sensors and mirrors do not mix. A reflective surface directly opposite can cause false triggers. Move the unit rather than living with it.
- Direct sunlight can confuse infrared. This matters in washrooms with a window opposite the basin.
- A locked cover is worth having anywhere the public can reach the unit. It stops the dispenser being emptied or filled with the wrong thing.
The touch-free options run from the 1000ml automatic soap and sanitiser dispenser through to foam units for higher-traffic rooms.
Mounting and placement
Height and position matter more than the model.
- Height. Mount the nozzle around 1.0 to 1.1m from the floor for adults, and 0.8 to 0.9m where children are the main users.
- Distance from the basin. Directly above or immediately beside the basin edge. If a user has to carry soap across a gap, the floor gets it.
- Left or right. Put it on the side people naturally reach with, which in a shared washroom means directly above the basin rather than to one side.
- Fixing. Tiled walls need the right plug and a careful drill position. Recessed units need a wall cavity and are a fit-out decision, not a retrofit.
Sanitiser is a different job
A sanitiser dispenser is not a soap dispenser in a different colour. Sanitiser belongs at the entrance, the exit or the point of service — where people do not have access to a basin. Soap belongs at the basin.
Many dispensers are rated for both, which makes stocking simpler, but keep the two jobs separate when you plan the room. A sanitiser unit by the door earns its place; a second one next to the soap does not.
A short checklist
- Estimate daily washes, then size the reservoir from the table above.
- Automatic for high traffic, food handling and medical; manual where simplicity wins.
- Foaming units need foaming soap — label the dispenser.
- Change batteries on a schedule, not when they fail.
- Mount at 1.0 to 1.1m, directly above or beside the basin.
- Two smaller dispensers beat one large one across two basins.
See the full range on the soap dispensers page, and the rest of the fit-out under washroom and housekeeping.
Toilet roll holders, shower heads and bath mats are on the bathware page.
Planning the rest of the washroom? See the paper towel dispensers and the hand dryers.
Frequently asked questions
Is a manual or automatic soap dispenser better for a commercial washroom?
It depends on traffic, who refills it and the hygiene expectation. Automatic units are touch-free and give a measured dose but need batteries or power and have more to go wrong. Manual units have nothing to fail and cost less to buy. Touch-free is a strong case for food handling, medical and childcare settings.
What size soap dispenser do I need?
Size the reservoir to the traffic. A single hand wash uses roughly 1 to 2ml of liquid soap, so 200 to 300ml suits a single cubicle or small office, 500ml a café or small clinic, and 800 to 1000ml a restaurant, school, gym or busy office. See the soap dispensers page.
Can I use ordinary liquid soap in a foam dispenser?
No. Standard liquid hand soap in a foaming unit will block the pump, which is the most common reason a foam dispenser stops working. Use foaming soap and label the dispenser.
How high should a soap dispenser be mounted?
Mount the nozzle around 1.0 to 1.1m from the floor for adults, and 0.8 to 0.9m where children are the main users, directly above or immediately beside the basin edge.
How often should the batteries in an automatic soap dispenser be changed?
On a schedule rather than when they fail. Most units run on standard alkaline cells and last months rather than weeks, and they usually slow down before they stop, so weak soap is the first sign. Keep a spare set in the cleaner's cupboard.