How is the Harvia Pro 20 kit installed?
The Harvia Pro 20 stands on its adjustable legs on the WL100 bedding, with the WL550 sheath around it, and the WHP1500 chimney rises from the stove's top opening through the ceiling and roof. Harvia's manual says all local regulations apply, that the stove is not suitable for a shared flue, that no electrical devices, wires or combustible materials may sit within the safety distances, and that the local fire authorities can give detailed fire-safety requirements. Harvia's manuals, under Documents, give the step-by-step installation of the stove, the chimney, the sheath and the bedding.
What floor does the Harvia Pro 20 kit need?
The Harvia Pro 20 kit's WL100 bedding is the protection Harvia's manual asks for under the Pro 20 on a tile floor, whose adhesives and waterproofing do not resist the stove's heat, and on a floor made of combustible material. A combustible floor also needs non-combustible protection in front of the stove door, which the kit does not include. A bare concrete floor at least 2.4" (60 mm) thick needs no protection. The floor must be strong enough to carry the stove.
Harvia Pro 20 kit safety distances
Keep at least these distances between the Harvia Pro 20 and anything that can burn.
Harvia Pro 20 without a sheath (Harvia manual Y05-1330-1)
| Top of the stove to the ceiling |
51.2" (1,300 mm) |
| Sides to combustible material |
11.8" (300 mm) |
| Rear to combustible material |
11.8" (300 mm) |
| Front to combustible material |
11.8" (300 mm) |
| To a masonry wall |
2.0" (50 mm) if air can circulate in front and at one side; 3.9" (100 mm) in a recess |
Harvia Pro 20 with the kit's WL550 sheath fitted (Harvia manual Y05-1330-1)
| Sides |
2.4" (62 mm) |
| Rear |
2.4" (62 mm) |
| Front |
16.6" (422 mm) |
| Sheath to wall |
1.2" (30 mm) |
With the WL550 fitted, the side and rear distances fall to 2.4" (62 mm) and the front distance grows to 16.6" (422 mm).
Connecting the kit's chimney
The kit's Harvia WHP1500 chimney kit joins the Pro 20's 4.5" (115 mm) top opening with a smoke pipe cut to length; the rear opening stays closed with the blocking plug. It installs vertically only, suits roofs pitched 10° or more, and needs 3.94" (100 mm) from its insulated casing and 19.7" (500 mm) from the uninsulated smoke pipe to anything that can burn. The WHP1500 page gives the full roof and ceiling requirements.
Does the Harvia Pro 20 kit need a first firing?
Yes, outdoors. Harvia's manual says to fire the Pro 20 once outside before its first sauna, until the paint on the stove stops smoking, and to load the stones only after it has cooled.