DEWA load and electrical requirements for a home sauna

Sizing the load

A 1.8 by 2.0 by 2.1 metre cabin is 7.6 cubic metres, so an 8kW heater. Add a full glass front of roughly 4 square metres and you are at 9kW.

That is a genuine 9,000 watt continuous load, not an intermittent one. For comparison a domestic oven is around 3kW and a large split AC unit around 2 to 3kW. A sauna heater is one of the largest single loads most villas will ever add.

Single phase, three phase, and where the line falls

Up to 6kW: a dedicated 32A single phase circuit is normal, and most villas and many apartments can accommodate it if the board has a spare way.

From 9kW upward: generally three phase. Villas in Dubai commonly have a three phase supply. Apartments usually do not, and cannot easily get one.

That threshold is why apartments so often end up with an infrared cabin. Infrared panels draw 1.5 to 2.5kW and run from a standard 13A socket, so the whole question disappears.

What to check on your own board

Open the distribution board cover and look for spare ways — unused breaker positions with room for a 32A device. If every way is occupied, you need either a board change or a submain, and both cost money before any sauna work starts.

Look at the main incomer rating. If it is 60A or 80A single phase and your villa already runs several AC units, a 9kW heater on top may exceed the diversity the supply was designed around, even if there is physically a spare way.

Look for three phase: three live conductors into the main switch rather than one. If you have it, larger heaters become straightforward.

What the installation needs

A dedicated circuit, not a spur off something else. Correctly rated cable for the run length, sized for voltage drop rather than just current — long runs to a garden cabin need up-sizing.

RCD protection appropriate to the circuit.

An accessible isolator near the cabin, outside it, so the heater can be isolated for servicing without pulling a breaker in another room. For outdoor cabins this must be weatherproof and IP-rated.

Controls mounted outside the cabin. Temperature limiter fitted. On commercial installations, an occupancy timeout or door interlock.

Board upgrades, and what they cost

If there is no spare way, expect AED 6,000 to 15,000 for a board change or submain depending on the property and the run. It is a real cost and it should appear on your quote as its own line rather than surfacing later as a variation.

This is the single most common reason a sauna quote comes back higher than someone expected, and it is entirely avoidable as a surprise — any contractor who has not opened your board has not actually priced your job.

DEWA and certification

Adding a dedicated circuit within an existing property is normally electrician's work under the property's existing supply rather than a new DEWA application. A supply upgrade — increasing the incomer rating — is a DEWA matter and takes considerably longer.

Get the electrical certification and keep it. It matters for insurance, and it matters again when the property is sold and someone asks what the 32A circuit in the dressing room feeds.

Steam generators, briefly

Same principles, different numbers. A domestic steam generator for a porcelain-finished room is typically 9 to 12kW, which puts most of them into the same three phase conversation as a large sauna heater.

Generators also need a water feed and a drain for the flush cycle, so the location has to work for three services rather than one.

Checking your board before you commit

We open the distribution board at survey rather than assuming, because a board with no spare way changes the price meaningfully. Sauna heater sizing and supply covers the calculation, and sauna room installation covers the build the circuit is feeding.

Steam generator supply follows the same logic with an added water feed and drain. We do sauna and steam room installation in Dubai with a free survey and a fixed quote afterwards.