Harvia Pro 20 RS Pro Series, 24.1kW, Sauna Wood Stove with Water Tank
The Harvia Pro 20 RS is a 24.1kW wood-burning sauna stove for rooms from 283 to 706 cubic feet with a fixed 30-litre water tank built into the right side of the heater. RS stands for Right Side - the tank position that distinguishes this model from the LS (Left Side) variant. The water heats simultaneously as the stove heats the sauna, and the tap for dispensing hot water is located at the front of the heater for convenient access from within the sauna room. No separate water heating equipment is needed. The graphite black steel body with stainless steel front and top is the signature Pro Series finish - durable, easy to clean, and refined in appearance. The cast-iron glass hatch faces into the sauna room, filling the space with the warm glow of the fire. The reversible door direction is set during installation. 88 lbs of AC3020 stones (2 boxes, 10-15 cm) are required and sold separately. Adjustable feet simplify levelling. Flue: 115mm (4.5") European standard - a 6" North American adapter is required and sold separately. Pallet delivery - scheduled freight appointment required. CE and EAC certified. Made in Finland by Harvia.
Built-in 30-litre right-side water tank - hot water heated with the sauna
The defining practical feature of the Pro 20 RS is the integrated 30-litre water tank on the right side of the stove body. The tank heats water passively at the same time the stove heats the sauna - by the time the sauna is at temperature, the tank holds a full supply of hot water ready for use. There is no separate water heater to install, connect, or maintain. The dispensing tap is positioned at the front of the heater, accessible from inside the sauna room without reaching around the stove body. Harvia describes this directly: the tap for the water tank is located at the front of the heater, making it easy and safe to use. For a cottage sauna where hot water for washing, rinsing, or steam generation is needed and no separate plumbing is available, the built-in tank is the most practical single-unit solution in the Pro Series lineup.
Pro 20 platform - 24.1kW for rooms from 283 to 706 cu ft
The Pro 20 RS shares the full PRO 20 platform specification. At 24.1kW for rooms from 283 to 706 cubic feet, the stove is built for vigorous sauna bathing - reaching temperature quickly in smaller rooms and sustaining intense heat throughout sessions in larger ones. The large stone compartment holds 88 lbs of AC3020 stones for dense, hearty steam. The fire chamber and fire channels are designed by Harvia to ensure the sauna heats quickly and the fire burns cleanly. The graphite black exterior with stainless steel front and top is designed for easy maintenance - the stainless surfaces resist heat discolouration and wipe clean without treatment. The stove can be equipped with the WL550 protective shield (sold separately), which is specific to the PRO 20, PRO 20 RS, PRO 20 LS, and PRO 20 SL and reduces clearances to combustible materials further when installed.
Safety distances and installation notes for the RS configuration
The Pro 20 RS has wider safety clearances than the standard PRO 20 due to the water tank on the right side: 11.81" (300mm) on all sides - front, left, right, and back - from combustible materials. To non-combustible materials, the side and back clearances reduce to 3.94" (100mm). Ceiling clearance is 4.27 ft (1,300mm) from the top of the heater. These clearances are measured from the outermost point of the stove body including the tank. The minimum room ceiling height is 6.56 ft. Maximum firewood length is 15" (390mm) with a diameter of 3" to 6" (80-150mm). Top or rear flue connection options are available. A licensed chimney professional is recommended for all flue installations. All wiring and installation must follow the installation manual.
24.1kW wood-burning sauna stove for rooms from 283 to 706 cubic feet. Pro 20 RS - 30-litre water tank fixed on right side, heats water simultaneously with sauna. Front tap for easy dispensing. No separate water heater needed. Graphite black body with stainless steel front and top. Cast-iron glass hatch faces into sauna - reversible door direction. No electricity required. 88 lbs AC3020 stones required (2 boxes, 10-15 cm, sold separately). Safety distances: 11.81" front, 11.81" sides, 11.81" back (combustible). 4.27 ft ceiling clearance. Top or rear flue connection. 115mm flue - 6" adapter required for North America (sold separately). Max firewood 15" / 3-6" diameter. Dimensions: 22.8"W x 20.1"D x 29.9"H. Adjustable feet. WL550 protective sheath compatible. Pallet delivery - scheduled freight required. 2-year warranty (consumer). CE and EAC certified. Made in Finland by Harvia.
24.1 kW 283 to 706 cu ft Pro Series - built-in right-side water tank 30-litre water tank - heats water with sauna Front tap - easy and safe water dispensing Wood-burning - no electricity required Graphite black body - stainless steel front and top Cast-iron glass hatch - reversible door direction 88 lbs AC3020 stones required (2 boxes, 10-15 cm) Safety: 11.81" front, 11.81" sides, 11.81" back Top or rear flue connection 115mm flue - 6" adapter required for North America Max firewood 15" / 3-6" diameter 22.8"W x 20.1"D x 29.9"H Adjustable feet WL550 protective sheath compatible Pallet delivery required 2-year warranty (consumer) CE and EAC certified - made in Finland
⚠️ 88 lbs AC3020 stones (2 boxes, 10-15 cm) required - not included. 6" North American flue adapter required - not included. Pallet delivery. Stones and the 6" adapter must be purchased separately. An additional box of stones is recommended for selection of best-fitting stones. This stove ships by scheduled pallet freight - a delivery appointment is required. At 132.3 lbs net weight, plan for on-site assistance to move the stove from the pallet delivery point to its installation position. A licensed chimney professional is recommended for all flue installations.
ℹ️ PRO 20 RS vs PRO 20 LS vs PRO 20 - right-side tank vs left-side tank vs no tank, same platform. PRO 20 WKPR20M: no integrated water tank - standard interior feed configuration, tighter safety clearances (4" sides, 4" back, 12" front). PRO 20 LS WKPR20LSM: 20-litre water tank on the left side - same PRO 20 platform with left-side tank placement. PRO 20 RS WKPR20RSM (this listing): 30-litre water tank on the right side - the larger tank variant, same 24.1kW output and 283-706 cu ft range, wider safety clearances (11.81" on all sides) due to the tank body. All three share the same output, room range, stone requirement (88 lbs, 2 boxes AC3020), and WL550 shield compatibility. Choose the RS for the larger 30-litre tank on the right side. Choose the LS for the left-side tank placement. Choose the standard PRO 20 if no integrated water tank is needed and tighter safety clearances are preferred.
Specifications
Performance
| Power output |
24.1 kW |
| Fuel type |
Wood - no electricity required |
| Room volume |
283 to 706 cu ft (8-20 m3) |
| Stone capacity |
88 lbs / 40 kg (2 boxes AC3020, 10-15 cm) - sold separately |
| Stone size |
O 10-15 cm (AC3020) |
| Max firewood length |
15 in (390 mm) |
| Firewood diameter |
3 in to 6 in (80-150 mm) |
Built-in water tank (RS)
| Tank position |
Right side of heater body |
| Tank capacity |
30 litres (approx. 8 US gallons) |
| Tap position |
Front of heater - accessible from inside sauna |
| How it works |
Water heats simultaneously as sauna heats up |
| Separate water heater needed |
No |
Safety distances (combustible materials)
| Front |
11.81 in (300 mm) |
| Left side |
11.81 in (300 mm) |
| Right side |
11.81 in (300 mm) |
| Back |
11.81 in (300 mm) |
| Ceiling clearance |
4.27 ft (1,300 mm) above heater top |
| Side / back (non-combustible) |
3.94 in (100 mm) |
| Minimum room ceiling height |
6.56 ft (2,000 mm) |
Physical dimensions
| Width (including tank) |
22.8 in (580 mm) |
| Depth |
20.1 in (510 mm) |
| Height |
29.9 in (760 mm) |
| Net weight (stove only) |
132.3 lbs (60.0 kg) |
| Gross weight (packaged) |
139.1 lbs (63.1 kg) |
| Package width |
26.0 in (660 mm) |
| Package depth |
20.1 in (510 mm) |
| Package height |
29.9 in (760 mm) |
Construction and finish
| Body color |
Graphite black (sides) |
| Front and top |
Stainless steel - easy to clean |
| Ash box |
Stainless steel |
| Glass hatch |
Cast-iron framed - reversible door direction |
| Legs |
Adjustable feet |
| Installation |
Floor-mounted, vertical orientation |
Flue and installation
| Flue connection diameter |
115mm (4.5") - standard European |
| Flue connection position |
Top or rear - selected during installation |
| North American adapter |
6" (155mm) adapter required - sold separately |
| Delivery |
Scheduled pallet freight - appointment required |
Certifications, optional accessories, and compliance
| Certifications |
CE / EAC certified |
| Origin |
Made in Finland by Harvia |
| Warranty |
2-year limited (consumer use) |
| Protective sheath |
Harvia WL550 (specific to PRO 20 / RS / LS / SL) |
| Chimney water heater |
WHP500M, WHP1000M, WHP1500M (sold separately) |
| North American flue adapter |
Harvia WZ115155 (6" / 155mm) |
| Flue pipe extensions |
Harvia WZ11520, WZ11550, WZ115100 |
What's included
Harvia Pro 20 RS wood-burning sauna stove with built-in 30-litre right-side water tank
Cast-iron framed glass hatch (reversible door direction)
Frame
Grill
Adjustable feet
Installation and operating instructions
2-year limited warranty (consumer use)
Required (not included): 88 lbs AC3020 stones - 2 boxes, 10-15 cm (additional box recommended); 6" North American flue adapter (Harvia WZ115155). Optional accessories (sold separately): WL550 protective sheath; chimney water heaters (WHP500M, WHP1000M, WHP1500M); flue pipe extensions (WZ11520, WZ11550, WZ115100). A licensed chimney professional is recommended for all flue installations.
Why the Harvia Pro 20 RS stands out
Built-in 30-litre water tank - hot water ready when the sauna is
The Pro 20 RS's right-side water tank heats 30 litres of water passively while the stove heats the sauna. No separate water heater is needed, no connections are required beyond filling the tank, and no additional fuel is consumed - the heat that warms the sauna also heats the water. By the time the sauna reaches bathing temperature, the tank holds a full 30 litres (approximately 8 US gallons) of hot water ready for use. For a cottage sauna without running hot water, this single-unit solution covers both the sauna session and post-sauna washing without any additional equipment.
Front tap - convenient and safe dispensing
The water tank tap is positioned at the front of the heater, directly accessible from inside the sauna room without reaching around or behind the stove body. Harvia specifically notes this placement as making the tap easy and safe to use. For a sauna room where the stove is positioned against a wall, front tap access means hot water is dispensed from the bather-facing side at a comfortable height and reach. The tap position is a practical design detail that distinguishes the RS from aftermarket tank solutions where tap placement is often less convenient or requires more awkward access.
24.1kW for vigorous bathing - 283 to 706 cu ft
The Pro 20 RS delivers the same 24.1kW output as the standard PRO 20 platform. The output is sized for vigorous sauna bathing - bringing a 283 cu ft room to temperature rapidly and sustaining intense bathing temperatures in a 706 cu ft space throughout a long session. The 88-lb stone load produces dense, hearty steam for high-intensity sauna use. The fire chamber and fire channels are engineered to heat the sauna quickly and burn cleanly. For a cottage sauna that runs weekly through cold months, the PRO 20 platform provides the output and stone capacity required to perform reliably session after session.
Graphite black body with stainless steel front and top
The Pro 20 RS uses the signature Pro Series finish: graphite black painted steel on the sides and a stainless steel front, top, and ash box. The stainless steel surfaces resist heat discolouration and clean easily - important for surfaces that are handled regularly during wood loading and ash removal. The cast-iron glass hatch on the front face of the stove fills the sauna room with the warm glow of the fire during the session. The reversible door direction is set during installation to suit the approach direction and bench layout. Adjustable feet allow the stove to be levelled on any floor surface.
WL550 protective sheath compatible
The WL550 is the model-specific protective sheath for the PRO 20, PRO 20 RS, PRO 20 LS, and PRO 20 SL. When installed, it reduces the safety distances to combustible materials further than the stove's standard clearances, providing additional bench placement flexibility in the sauna room. For installations where the RS configuration's 11.81" side and back clearances limit bench positioning, the WL550 is the accessory that resolves the constraint. It is sold separately at BathingBrands and can be added at any point after the stove is installed.
Pro Series platform - multiple RS and related configurations
The WKPR20RSM is the right-side 30-litre tank variant of Harvia's Pro 20 platform. The same 24.1kW platform is also available as: standard interior feed without tank (PRO 20, WKPR20M), with 20-litre left-side water tank (PRO 20 LS, WKPR20LSM), exterior feed through wall with fireplace view in adjacent room (PRO 20 SL, WKPR20SLM), and dual-room sauna-plus-fireplace combination (PRO 20 Duo). All share the 283-706 cu ft range, 88-lb stone requirement, and WL550 shield compatibility. Designed, engineered, and made in Finland by Harvia. We are an authorized Harvia dealer.
About Harvia
Made in Finland - CE Certified - Pro Series - Built-In Water Tank
Harvia Pro 20 RS. 24.1kW. 283-706 cu ft. Built-in 30-litre right-side water tank. Graphite black.
Harvia is a Finnish sauna and spa company established in 1950. The Pro 20 RS is a popular choice for cottage saunas because of its practicality - a 30-litre water tank on the right side heats water simultaneously with the sauna, with a front-position tap for easy, safe dispensing. 24.1kW output, 88 lbs of AC3020 stones, graphite black body with stainless steel front and top, and cast-iron glass hatch. 88 lbs AC3020 stones (2 boxes) and a 6" North American flue adapter are required and sold separately. Pallet delivery. We are an authorized Harvia dealer.
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24.1kW wood-burning - 283-706 cu ft - no electricity required
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Built-in 30-litre right-side water tank - front tap - heats with sauna simultaneously
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Graphite black body - stainless steel front and top - cast-iron glass hatch
- Safety distances: 11.81" front, 11.81" sides, 11.81" back
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88 lbs AC3020 stones (2 boxes) required - 6" adapter required - both sold separately
PRO 20 RS vs PRO 20 LS vs PRO 20 - Pro Series water tank comparison
PRO 20 RS vs PRO 20 LS vs PRO 20 - choosing the right Pro Series configuration
Three Pro Series configurations cover the 283-706 cu ft range at 24.1kW. PRO 20 WKPR20M: no built-in water tank - the standard configuration with tighter safety clearances (4" sides, 4" back, 12" front). The right choice when no integrated hot water supply is needed and minimum safety clearances are a priority for bench placement. PRO 20 LS WKPR20LSM: 20-litre water tank on the left side of the stove - same PRO 20 platform, smaller tank capacity than the RS, left-side tank position. Choose when the left side of the stove faces the available room area or when a 20-litre capacity is sufficient. PRO 20 RS WKPR20RSM (this listing): 30-litre water tank on the right side - the largest integrated tank in the Pro 20 Series, right-side tank position, front tap, 11.81" clearances on all sides from combustible materials. The right choice for cottage saunas where maximum hot water capacity from a single integrated unit is the priority and the right-side position suits the room layout. All three accept the WL550 protective sheath and share identical output, stone requirement, and platform specifications.
Manuals and Documents
Warranty
2-year limited warranty (consumer use)
The Harvia Pro 20 RS is covered by Harvia's 2-year limited warranty from the date of purchase for consumer use. The warranty covers defects in manufacturing and materials under normal use conditions. The warranty does not cover damage caused by improper installation, use of incorrect stone type or size (non-AC3020, or stones outside the 10-15 cm specified diameter range), operating without the required stone load, failure to follow the installation and operating guidelines in the manual, damage from inadequate chimney maintenance, soot fires, or damage resulting from operating the water tank without adequate water levels. A licensed or certified chimney professional is recommended for all flue installation and regular chimney sweep maintenance. Proof of purchase from an authorized Harvia dealer is required for warranty claims. We are an authorized Harvia dealer.
