Harvia Electric Sauna Heaters (KIP, Cilindro & Vega)

How to size a Harvia heater: about 1kW per cubic metre. KIP covers 3-9kW wall-mounted, Cilindro reaches 10.5kW with far more stone for heavier löyly.

Buy on Harvia

By Rob Griffiths5 min read

How do you size a Harvia heater to your sauna?

Measure the room's length, width and height and multiply them for the volume in cubic metres. Harvia's guidance is about 1 kW of output per cubic metre, so a 2m × 2m × 2m cabin is 8 m³ and wants roughly an 8 kW heater.

Two things push that number up. Glass and uninsulated stone lose heat far faster than an insulated timber wall, so Harvia counts every square metre of it as though it added about 1.2 m³ to the room; uninsulated log walls count for about 1.5. A small cabin with a full glass door and a stone feature wall can therefore need a noticeably bigger heater than its raw volume suggests.

When you fall between two sizes, size up. An undersized heater has to run longer and harder to reach temperature, which shortens its working life as well as your patience waiting for it.

KIP, Cilindro or Vega: which Harvia range fits?

Harvia's home line-up splits three ways, and the choice is mostly about how much stone you want sitting above the elements. More stone means steam that keeps coming instead of a sharp burst that fades.

KIP - the default home heater

Wall-mounted, 3kW to 9kW (KIP30, KIP45, KIP60, KIP80, KIP90), with either a built-in control panel or a separate control unit. Stainless steel elements and triple-wall construction keep the outer surface cooler. This is the range most UK home cabins end up with.

Cilindro - for the best löyly

A stainless steel cylindrical column available floor-standing or wall-mounted, from 6kW to 10.5kW. Its shape carries far more stone than a flat wall heater - up to around 100kg on the larger models - which is what produces thick, sustained steam. Choose it if steam quality matters more than footprint.

Vega - for the smallest rooms

Compact wall-mounted stainless units for tight spaces, with the Vega Compact models starting well under 3.5kW. The steam is crisp and authentic, but the smaller stone load will not carry a long, heavy löyly session the way a Cilindro does.

What should you check before installing one in the UK?

Buy the UK or EU specification

Plenty of Harvia listings online are US-market units quoted at 240V 60Hz. Match the model to a UK 230V 50Hz supply rather than importing on price.

Confirm the electrical supply first

A sauna heater needs its own dedicated circuit, and the larger outputs may need a three-phase supply. Check the exact requirement in that model's installation manual with a qualified electrician before you buy - it is the step most likely to change which heater you can actually fit.

Respect the clearances

Every model specifies minimum distances to benches, walls and ceiling. These are safety limits, not guidance, and they affect where the heater can go in a small cabin.

Stack the stones properly

Use the stone size the manual specifies and stack loosely so air can move between them. Packed-tight stones make the elements work harder. Stones break down with heat over time, so restack and replace them periodically.

Frequently asked questions

What size Harvia heater do I need for a 6 m3 sauna?

About 6 kW, which is the KIP60 in Harvia's range. The rule is roughly 1 kW per cubic metre, so measure length by width by height, then add the equivalent of 1.2 m3 for each square metre of glass or uninsulated stone in the room before you pick the output.

Is the Harvia KIP wall-mounted or floor-standing?

The KIP range is wall-mounted, as is the compact Vega. If you want a floor-standing heater, the Cilindro column is offered in both floor and wall-mounted versions.

Which Harvia heater gives the best steam?

The Cilindro. Its cylindrical body holds substantially more stone than a flat wall-mounted heater - up to around 100kg on the larger models - and that stone mass is what lets it produce thick löyly repeatedly instead of one sharp burst.

Can you throw water on a Harvia electric heater?

Yes. Harvia's traditional electric heaters, including the KIP series, are designed for water to be thrown over the stones to make löyly. Use a ladle of plain water, not a jugful, and never pour water anywhere but on the stones.

Do you need three-phase power for a Harvia sauna heater?

It depends on the output. Smaller home heaters generally run from a dedicated single-phase circuit, while larger ones may require three-phase. The model's installation manual states the requirement, and a qualified electrician should confirm what your supply can carry before you order.

Type: Electric sauna heater
Power range: 3-10.5kW across the home ranges (KIP30 3kW / KIP45 4.5kW / KIP60 6kW / KIP80 8kW / KIP90 9kW; Cilindro 6-10.5kW), plus larger commercial models
Voltage: 230V single-phase 32A (4-6kW) or 400V 3-phase (8kW+)
Control: Digital wall control standard or external Xenio control unit
Stone capacity: About 10-30kg on wall-mounted KIP and Vega models; up to around 100kg on larger Cilindro column heaters
Smart features: WiFi-connected Xenio control (premium add-on) for time-of-use scheduling
Steam option: KIP series accept water injection (löyly)
Price (UK): £400-£1200 depending on size and features
Warranty: 2 years standard; extended via Xenio control upgrade
Mounting: KIP and Vega are wall-mounted; Cilindro is available in floor-standing and wall-mounted versions