Harvia
Harvia Delta sauna heater
Harvia makes the Delta in 2 sizes, from 2.3 to 3.6 kW, for saunas of 46 ft³ to 159 ft³. Slide to your room size to see which one fits, how fast it heats and what it needs from your fuse box.
Updated Oct 18, 2026
Output
2.3–3.6 kW
Rooms
46 ft³–159 ft³
Stones
24 lb
Sizes
2
Which size fits your sauna?
Your room's effective volume
67 ft³
Best fit: D23
Work out your effective volumeEffective volume = inside volume, plus 1.2 m³ for every m² of glass, tile or stone; × 1.5 for solid log walls (Harvia's rule, used by most planners).
Sizes and specifications
| Model | Output | Room range | Stones | Heat-up | Per session |
|---|---|---|---|---|---|
| Delta D23HD234M, HDE234M | 2.3 kW | 46 ft³–88 ft³ | 24 lb | 45–60 min | $0.53 |
| Delta D36HD364M, HDE364M | 3.6 kW | 71 ft³–159 ft³ | 24 lb | 30–40 min | $0.68 |
Heat-up and cost are our heat model's estimate for each size in a room at the middle of its range: indoor, insulated walls, 68 °F around the sauna, heated to 176 °F, one hour of bathing, electricity at $0.18/kWh (United States average).
Electrical connection
| Model | Supply | Current | Fuse / breaker | Cable |
|---|---|---|---|---|
| Delta D23 | 1~ 230 V | 10 A | – | – |
| Delta D36 | 1~ 230 V | 15.7 A | – | – |
Current is computed from the output; fuse and cable are shown where the maker or dealer states them. A licensed electrician sizes and installs the circuit following the heater's manual and local rules.
Where to see it
- Delta D23€257 at esaunashop.com (2026-10-18)
- Delta D23€574 at esaunashop.com (2026-10-18)
- Delta D36€287 at esaunashop.com (2026-10-18)
- Delta D36€597 at esaunashop.com (2026-10-18)
Prices and availability come from the shop or maker and change; their page is what counts. Shop offers are added as retailers join.
Sources
- esaunashop.com/harvia-delta-d23-2-3-kw-9319dealer · read 2026-10-18
- esaunashop.com/harvia-delta-d23e-2-3-kw-9322dealer · read 2026-10-18
- esaunashop.com/harvia-delta-d36-3-6-kw-9321dealer · read 2026-10-18
- esaunashop.com/harvia-delta-d36e-3-6-kw-9324dealer · read 2026-10-18
Other heaters for the same rooms
Questions and answers
What size sauna does the Harvia Delta heat?
Harvia rates the sizes for these rooms: Delta D23 46 ft³–88 ft³; Delta D36 71 ft³–159 ft³. Use your room's effective volume: add 1.2 m³ for every m² of glass, tile or stone, and multiply by 1.5 for solid log walls.
What fuse or breaker does the Harvia Delta need?
It depends on the size and your supply: Delta D23: 1~ 230 V: 10 A; Delta D36: 1~ 230 V: 15.7 A. A licensed electrician sizes the circuit from the heater's manual and local rules.
How long does the Harvia Delta take to heat up?
In a well-insulated indoor room at the middle of each size's range, our heat model gives: Delta D23 45–60 min; Delta D36 30–40 min to reach 176 °F. Outdoor saunas, glass and cold weather take longer.
How many stones does the Harvia Delta take?
As stated by Harvia: Delta D23 24 lb; Delta D36 24 lb. Use the stone size the manual specifies and re-stack the stones at least once a year, replacing crumbled ones.