Your CircuitSolver FAQs – Answered!

Your CircuitSolver FAQs – Answered!

We frequently receive questions about DHWS design, CircuitSolver applications, and our other plumbing products during calls with our representative agencies. Below are some of the most commonly asked questions:

Q1: Do you have to use CircuitSolver with a variable speed recirculation pump?

A1: No, CircuitSolvers may be installed in systems using standard fixed speed or variable speed recirculation pumps. However, some features of a variable speed pump, also known as a “smart” pump, can be an excellent match with CircuitSolvers.

Q2: What happens during system start-up when using a fixed speed pump and CircuitSolver?

A2: At startup, CircuitSolvers are fully open, therefore GPM is high and head loss is low, allowing the system to balance quickly. As water temperature rises to the CircuitSolver’s set-point the valve modulates “closed”, adding friction/head loss and reducing the flow from the pump. As a result, the flow required to offset heat loss will be satisfied.

Q3: How do you size the recirculation pump in systems with CircuitSolver?

A3: Pumps should be appropriately sized to offset total system heat loss, whether it is a fixed speed or variable speed pump. Systems should not be sized for start-up, they should be sized for normal operation of the recirculation system. The CircuitSolver Design Guide can help you calculate flow, pressure loss, and the recirculation pump size of your system. The design guide is available on our website’s plumbing specs page here.

Q4: Can CircuitSolver work in the same recirculation system as an aquastat?

A4: Yes, CircuitSolvers are able to function in systems with aquastats, however ASHRAE, ASPE, and OSHA strongly advise against turning off recirculation pumps with aquastats.

Q5: Do you have BIM and Revitt files on your website?

A5: Yes! CircuitSolver BIM and Revitt files are available on our website’s plumbing specs page here:

The answers to more CircuitSolver FAQs can be found on our website:

If you have any additional product or applications questions, please do not hesitate to email or call me.