3-in-1 Bathroom Heaters: Heat Lamps vs Fan-Forced

What is a 3-in-1 bathroom heater?

A 3-in-1 unit replaces three separate fittings with one. The heater takes the chill off on winter mornings, the light gives general lighting for the room, and the exhaust fan removes steam and moisture. Most are wired to a multi-gang wall switch so each function can be turned on separately, and many exhaust fans are set up to run on after the light is switched off.

In a climate like Albury-Wodonga, with cold, frosty winter mornings, a bathroom heater is one of the most appreciated fittings in the house. It is also one of the easiest to plan into a renovation or new build, because the unit, ducting and switching all go in at once.

Heat lamps or fan-forced: which is better?

Neither is better in every bathroom. The right choice depends on the size of the room, how you use it and how quickly you want to feel warm.

What size bathroom heater do I need?

For heat lamp units, two lamps usually suit a small bathroom and four lamps suit a medium to larger bathroom. For fan-forced units, check the manufacturer's recommended room size and heating output. In a large bathroom or an ensuite with a high ceiling, a more powerful fan-forced unit, or a separate heater, may be needed.

Position matters too. Mount a heat lamp unit where you stand when you get out of the shower or dry off, rather than in the exact centre of the ceiling. Your electrician will also check the required clearances from the shower and bath.

How much extraction does a bathroom need?

Extraction is measured in cubic metres per hour (m³/h) or litres per second (L/s). A simple way to estimate what you need is to work out the room volume (length x width x ceiling height) and aim for the exhaust to change the air many times an hour. Many guides suggest 10 to 15 air changes an hour for a bathroom.

For example, a bathroom 3m long, 2.5m wide and 2.4m high has a volume of 18m³. At 10 air changes an hour it needs about 180m³/h of extraction, which is about 50 L/s. Building codes set minimum rates for new work, so your builder or electrician will confirm what applies to your home.

Should the exhaust be ducted outside?

Yes. Ducting the exhaust to the outside, through a wall, eave or roof vent, is the most effective way to remove moisture and prevent condensation and mould. Venting into the roof space simply moves the damp air somewhere you cannot see it.

3-in-1 units come as ceiling-ducted or side-ducted models. Side-ducted units suit homes with limited roof space or where the duct needs to run sideways to an outside wall. Keep duct runs as short and straight as practical, because long runs with many bends reduce the fan's performance.

What else should you think about?

A few practical details make the difference between a bathroom heater you love and one you put up with.

• Switching: plan a separate switch for heat, light and exhaust, and consider a run-on timer for the exhaust.
• Light colour: choose a light colour that suits the rest of the bathroom, and check it works for shaving and make-up.
• Ceiling space: check there is enough space above the ceiling for the unit and ducting, especially under low-pitched roofs.
• Safety: bathroom heaters must be installed by a licensed electrician, who will follow the wiring rules for wet areas.
• Existing cut-outs: in a renovation, measure the existing hole so the new unit covers it.

Which brands do we stock?

At Lighting Bonanza in Albury we stock 3-in-1 bathroom units and exhaust fans from brands including Martec, Ventair and Domus, in both side-ducted and ceiling-ducted styles. You can compare models on display and browse the Martec, Ventair and Domus bathroom catalogues on our catalogues page. Bring your bathroom's dimensions and ceiling height in, and we will help you choose a unit that suits the room.