When you think of a spa, images of relaxation, warmth, and comfort often come to mind. Central to the spa experience is the soothing temperature of the water, which must be carefully controlled to ensure that it remains at the desired level of comfort. Capillary thermostats are crucial components in spa systems, helping maintain the perfect water temperature and ensuring the safety, energy efficiency, and overall satisfaction of spa-goers. To view STEMCO’s line of capillary thermostats, click here.
What is a Capillary Thermostat? 
A capillary thermostat is a temperature control device that relies on a temperature-sensitive fluid enclosed within a flexible capillary tube. The working principle is simple yet highly effective: as the temperature of the fluid changes, it expands or contracts, thereby causing mechanical movement within the thermostat. This movement, in turn, triggers the thermostat to open or close an electrical circuit.
In the context of spa systems, capillary thermostats are used to control the temperature of the spa water, ensuring it remains at the ideal comfort level. Let’s explore how capillary thermostats are employed in spa systems:
1. Temperature Regulation
One of the primary functions of capillary thermostats in spa systems is to regulate the water temperature. Users can set their preferred water temperature, and the thermostat continuously monitors the water’s temperature, turning the spa’s heating element on or off as needed to maintain the desired warmth. This level of precision ensures that spa-goers enjoy a consistently comfortable experience.
2. Safety First
Safety is paramount in spa systems, and capillary thermostats play a significant role in this regard. They can be configured to cut off power to the heating element if the water temperature rises to potentially dangerous levels. This critical safety feature helps prevent scalding and ensures that the spa water remains safe for use.
3. Energy Efficiency 
In an age when energy efficiency is a growing concern, capillary thermostats offer a solution for spa systems. By controlling the heating element based on the desired temperature, they help conserve energy. The heating element operates only when necessary, reducing operational costs and making spa ownership more eco-friendly.
4. User Comfort
Spas are all about providing a tranquil and enjoyable experience for users. Capillary thermostats contribute to this by allowing individuals to set and maintain their preferred water temperature. With these thermostats, spa-goers can relax and unwind in a spa that perfectly suits their comfort preferences.
5. Equipment Protection
The longevity of spa equipment is essential for spa owners and operators. Capillary thermostats safeguard the spa’s heating system and its components by preventing overheating. This protection not only extends the lifespan of the equipment but also reduces maintenance costs and downtime.
