42% OFF - This Week Only!

Get an additional 12% discount with promo code “12OFF” on select items.

Backorder Notice

This product is currently backordered until November due to high demand. Orders may still be placed and will be fulfilled in the order received once inventory becomes available.

To order or for availability updates, please call us at (231) 861-8200.

Reserve now and place your order easily at the time of your no-cost reservation.

Includes Plastic Float (also sold separately).

This product shows the water level in Models HE-1100, HE-2100, GX10, GX15, and GX30. 

Instructions for use:

Insert your new Water Level Indicator (WLI) into the top front vent tube of your Outdoor Boiler with the sticker/indicator facing forward. Make sure the float body is perfectly horizontal before inserting. Use caution if you remove the WLI so you don’t pull the float off, as it is a snug fit. Add water when indicator reaches “ADD” or just above. Add water using only the OutdoorBoiler.com “In-House Fill Kit” installed indoors; using buckets or hose is not recommended. When adding water, add slowly and shut off water immediately when water overflows this vent tube onto furnace roof.

For more information, see your owner's manual and visit OutdoorBoiler.com.