Description
BWT mechanical level regulator RN305 white
The BWT mechanical level regulator RN305 white is a built in float valve system that automatically keeps the water level of your swimming pool stable. Designed to be installed in the pool wall next to the skimmer line, it monitors the water height and adds make up water whenever the level drops, protecting the filtration pump from loss of prime and keeping the skimming action efficient.
Main features of the BWT RN305 level regulator
- Mechanical float level regulator for in ground swimming pools.
- Manufactured from white UV stabilised ABS for long term outdoor use.
- Matching frame and cover design to BWT Aquareva skimmers for a uniform look.
- Telescopic support under the lid to match the final deck or coping level.
- Bayonet locking cover that prevents accidental opening by children or pets.
- Adjustable float valve for precise water level setting.
- Outlet for 50 mm or 63 mm PVC pipe connection to the pool shell.
How the RN305 mechanical level regulator works
Inside the body of the BWT mechanical level regulator RN305 white is a float connected to a small brass fill valve. When the pool water level is correct, the float keeps the valve closed and no water is added. As soon as water is lost through evaporation, splash out or backwashing and the level drops, the float moves down and opens the valve, allowing fresh water to enter the compensation chamber and the pool. Once the preset level is reached again, the float lifts and shuts off the supply.
Because the system is purely mechanical, it does not require electricity, control panels or sensors. This makes the RN305 a robust and low maintenance solution for keeping the waterline stable day after day.
Construction and materials
The BWT RN305 level regulator is built for permanent installation in the pool structure and continuous contact with treated pool water. The housing, frame and cover are moulded in UV treated ABS, which keeps its glossy white colour over time and resists normal exposure to chlorine and other pool chemicals. The internal float valve assembly uses a brass body with a removable mechanism, which makes servicing or replacement easier if needed.
- UV stabilised ABS body and lid for colour stability and chemical resistance.
- Internal brass float valve that can be removed for maintenance.
- Integrated mounting points for secure installation in concrete or block walls.
- Sealing elements sized for a watertight connection to the pool shell and pipework.
Design integration with BWT skimmers
One of the strong points of the BWT mechanical level regulator RN305 white is its visual integration with BWT Aquareva skimmers. The frame and cover are identical in design to the skimmer covers from the same range, so the elements visible on the deck surface are coordinated in shape and colour. This gives a neat, uniform finish around the pool edge, with the level regulator cover almost indistinguishable from the skimmer covers.
- Same cover and frame style as BWT SL119 and related skimmers.
- Creates a consistent aesthetic between skimmers and level regulator on the pool deck.
- Square cover with bayonet closure for a clean, flush appearance.
Installation and hydraulic connection
The RN305 regulator is installed as a piece to be sealed in the pool wall, usually near the skimmer zone. It is connected on one side to the pool basin via a 50 mm or 63 mm PVC pipe and on the other side to the mains water supply through the float valve. The telescopic frame of the regulator allows the cover height to be adjusted to match the final deck level, whether you have coping stones, tiles or a deck finish.
- Built in body to be sealed into concrete or block walls at the correct waterline height.
- Outlet designed for 50 mm or 63 mm PVC pipe glued connection towards the pool.
- Water supply connection to the brass valve, normally via a 3/8″ threaded fitting.
- Telescopic upper section to align the cover with the finished beach or coping level.
To ensure proper operation, the regulator must be set at the same reference level as the skimmers so that the waterline remains within the optimal skimming range once the float is adjusted.
Operation, adjustment and maintenance
Once installed, the BWT mechanical level regulator RN305 white requires only simple checks. The initial float setting determines the target water level and can be fine tuned according to the local climate and the pool design. Periodically, the lid can be opened to clean the internal chamber, check for debris and verify that the float moves freely.
- Initial float adjustment to set the target water level a few centimetres below the coping.
- Occasional cleaning of the internal chamber to remove dirt or small debris.
- Visual verification that the float and valve move freely and shut off correctly.
- Closing of the water supply and draining of the regulator in regions with frost risk.
With basic seasonal checks and correct winterising in cold climates, the RN305 level regulator offers long term, reliable topping up of pool water without daily manual intervention.
Benefits for pool protection and comfort
By maintaining a stable water level, the BWT mechanical level regulator RN305 white improves both the comfort and safety of pool operation. The skimmers always work in their optimal range, the pump is less likely to draw in air and lose prime, and the aesthetic appearance of the waterline remains consistent.
- Protects the filtration pump from running dry due to low water level.
- Optimises skimming efficiency for cleaner pool surfaces.
- Reduces the need for manual topping up with a hose.
- Supports a constant waterline for a neat visual finish around the pool.
For new builds or renovation projects with BWT skimmers, the RN305 level regulator is a natural complement that combines automatic water level control with a coherent, high quality deck finish.
