Introducing the TMS1 System Bath Control w/button, a purpose-built retrofit kit designed for single-pump baths and spas. This complete replacement solution updates aging controls by pairing a new MDP-50 Control Box with a fresh topside button, delivering dependable, timer-based pump control with a streamlined setup.
What’s included and compatibility
- New MDP-50 Control Box (replaces Model 100823, 100820)
- NEW topside button for direct tub-side operation
- 120V, 60Hz electrical standard
- 20-minute timer for precise pump operation
- Plug-in wall outlet power for easy installation
- One-year warranty for added peace of mind
- Water level sensor is non-functioning (note: system operates without auto-level control)
Why this upgrade matters
The TMS1 is more than a replacement—it's a reliable upgrade path that simplifies service and improves daily use. With the MDP-50 control box, you gain a modern, compact control footprint designed to work with ONE Water Pump, reducing downtime and maintenance headaches. The included topside button puts control at your fingertips, making it easy to start and stop the pump from the tub edge, even if you’re mid-soak.
How it works and ideal use cases
- Ideal for replacing an old EP-823N setup in homes or guest bath spas that rely on a single pump
- Timer-based operation helps manage energy use and extend pump life by cycling on for defined intervals
- Plug-in power means quicker, simpler installation without complex wiring
- Topside button provides immediate, intuitive control during routine baths or spa sessions
Who should consider this kit
SPA owners updating an older control system, service technicians performing a straightforward retrofit, and property managers maintaining bath-spa installations will appreciate the clear upgrade path, compatibility with existing ONE Water Pump hardware, and the trusted one-year warranty that backs the product.
Practical tips and considerations
- Plan for a simple, plug-in installation using a standard wall outlet; ensure the space behind the panel accommodates the new MDP-50 box
- Because the water level sensor is non-functioning, rely on manual checks to ensure the tub is within safe operating levels during use
- Use the 20-minute timer to establish baseline pump cycles; adjust follow-up sessions based on your tub’s size and pump performance
Warranty and assurance
With a full one-year warranty, the TMS1 System Bath Control w/button offers dependable protection and support for your retrofit investment, helping you enjoy consistent performance and peace of mind in every bath.
