Harvia
Harvia Glow sauna heater
The Harvia Glow is a 6.8 kW heater that Harvia rates for saunas of 212 ft³ to 353 ft³. Check it against your room, see how fast it heats and what it needs from your fuse box.
Updated Oct 18, 2026
Output
6.8 kW
Rooms
212 ft³–353 ft³
Stones
176 lb
Sizes
1
Which size fits your sauna?
Your room's effective volume
283 ft³
Best fit: TRT70
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 |
|---|---|---|---|---|---|
| Glow TRT70 | 6.8 kW | 212 ft³–353 ft³ | 176 lb | 50–70 min | $1.50 |
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 |
|---|---|---|---|---|
| Glow TRT70 | 1~ 230 V | 29.6 A | – | – |
| 3~ 400 V | 9.8 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
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/electric-sauna-heater-harvia-glow-trt70xe-6-8-kwdealer · read 2026-10-18
Other heaters for the same rooms
Questions and answers
What size sauna does the Harvia Glow heat?
Harvia rates the sizes for these rooms: Glow TRT70 212 ft³–353 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 Glow need?
It depends on the size and your supply: Glow TRT70: 1~ 230 V: 29.6 A, 3~ 400 V: 9.8 A. A licensed electrician sizes the circuit from the heater's manual and local rules.
How long does the Harvia Glow take to heat up?
In a well-insulated indoor room at the middle of each size's range, our heat model gives: Glow TRT70 50–70 min to reach 176 °F. Outdoor saunas, glass and cold weather take longer.
How many stones does the Harvia Glow take?
As stated by Harvia: Glow TRT70 176 lb. Use the stone size the manual specifies and re-stack the stones at least once a year, replacing crumbled ones.