73-0123 TyloHelo Inc 12/4/2020
Rev. B Page 3 of 7 DS
Use: General
•Fill the BWT with clean, potable water. It is recommended that hard water with a high mineral content
not be used as it will result in a rapid limescale build-up.
oThe BWT tank will hold approximately 1.5 U.S. gallons of water but it is best to use no more
than 1 gallon when filling to prevent boil-over.
•The easiest way to fill up the BWT is to use a standard long-reach watering can. (Plastic is
recommended)
oPour the water through the open slots in the BWT cap.
•The small “cup” located on the edge of the filling cap is design to hold liquid fragrances.
oUse only water-based fragrance such as Rento Sauna Scent®.
oBe careful not to over-fill the fragrance cup.
•Turn the Laava heater on.
•The water in the BWT will begin to boil in about 12-15 minutes.
oYou will start to notice steam condensing on glass surfaces.
•You can start enjoying the sauna when it reaches temperatures of just 130-150°F.
oSee the Rule of 200, below.
•A full BWT can last an hour or more depending on the selected sauna temperature.
•While it is ok to use the Laava heater with the BWT empty, it is recommended to keep some water in the
vessel to minimize any potential deformity of the metal tank.
•The stainless steel of the BWT will turn brown over time and use. This is completely normal.
Note! Inspect the inside of the BWT at regular intervals. If you notice a lot of limescale on the bottom or
sides, remove the tank and clean it out. For stubborn build-up, use a solution of hot water and citric acid or
Opti-Clean® (available from your TyloHelo Dealer). Rinse well before re-installation.
Avoid filling the BWT when it is in use. Water splashed on the hot stones evaporates rapidly and
may cause burns. Do not pour water into an empty tank when the Laava heater is hot as the
steam may scald your skin.
Rule of 200:
A common formula used to determine the optimum temperature in a sauna is called the “Rule of 200”. Very
simply, take the displayed air temperature plus the humidity in the room. The sum should come close to 200,
which is a commonly accepted air temperature in many European saunas. The BWT will produce a constant
30% - 35% humidity so If the air temp is 140°F, then the air will feel like 175°F. Or, if you run your sauna at
170°F with BWT, your air will feel like it is 200°F. Adjust the sauna temperature to your desired setting.