AquaCal 0040S External Flow Relay Switch Kit
Best flow solution for heat pump owners with elevation or pressure issues.
The AquaCal 0040S External Flow Relay Switch Kit is an essential accessory for specific pool and spa heat pump installations. It's crucial when your pool or spa is situated at a higher elevation than the heat pump, or when a variable-speed pump on its low setting doesn't provide adequate water pressure. This kit also automates pool and spa thermostat switching, ensuring optimal performance and convenience. Designed for AquaCal systems, it addresses common installation challenges and enhances operational control.
$289.93
Owner Satisfaction
4.6
/ 5
Category Rank
175
/ 2960
#175 in Pool & Spa Accessories
Price vs Category Average
-12%
Below average
Weight
3
/ lbs
Who it's for
- AquaCal owners seeking guaranteed compatibility and easy installation
- Pool owners looking to maximize heat pump longevity
- Budget-conscious users aiming to reduce unnecessary energy consumption
Who should skip it
- Shoppers working with a strict, all-inclusive equipment budget
- Homeowners uncomfortable with complex electrical or plumbing tasks
- Owners of modern units with built-in flow sensors
Performance breakdown
Flow Sensitivity
Reliably triggers heat pumps even with low-flow variable speed settings.
Installation Versatility
Solves complex elevation challenges for elevated pool and spa setups.
Automation Efficiency
Seamlessly handles thermostat switching between pool and spa modes.
Build Durability
Stainless steel construction ensures long-term resilience in harsh pool environments.
System Compatibility
Engineered specifically for AquaCal systems to ensure perfect operational integration.
Operational Reliability
Provides consistent, worry-free performance for critical water flow management.
Key Specs
Weight
3 lbs
Part Number
AQC-0040S
Alternate Part Number
ECS0040S
Material
Stainless Steel
Accessory Type
Replacement Burr Set
Weight
48.0 ounces
Magnetic Attachment
false
Dishwasher Safe
false
Features
- Ensures proper activation at higher pool elevations.
- Compensates for low flow from variable speed pumps.
- Enables automatic thermostat switching.
- Designed for AquaCal heat pump systems.
- Reliable operational control.
- Addresses elevation and low-flow issues.
What customers say
The AquaCal 0040S earns strong marks primarily for its dependable function and straightforward installation. Consumers frequently highlight how this specific relay kit efficiently resolves persistent flow errors, restoring heat pump operation without complication. Its design prioritizes ease of use, allowing many owners to manage the replacement themselves. This reliability and simplicity make the 0040S a highly valued component for maintaining consistent pool comfort.
Know before you buy
Generally, no. This kit is specifically designed to solve flow issues caused by elevation differences or low-flow conditions from variable-speed pumps. If your system maintains adequate water pressure and flow without it, you likely do not need this installation.
No, the 0040S External Flow Relay Switch Kit is specifically engineered for AquaCal heat pump systems. It is not compatible with other brands.
Variable-speed pumps often run at lower speeds to save energy, which can sometimes result in water flow that is too low to trigger the heat pump's internal flow switch. This kit bypasses that issue, ensuring your heat pump activates reliably even when your pool pump is running at a lower setting.
Yes, it enables automatic thermostat switching, which allows your AquaCal system to seamlessly transition between your pool and spa temperature settings.
While it is a straightforward component, it involves electrical and plumbing connections related to your pool's circulation system. If you are not comfortable working with pool plumbing and low-voltage wiring, we recommend having a qualified pool technician perform the installation.
Still have a question?
Ask Hayley anything about this product before you decide.
Ready to buy?
$290