Neutra-Safe’s System Feeder is an automatic hydronic and thermal solar system feeder. Its 6-gallon tank introduces fluid while maintaining pressure in closed-loop systems. A digital pressure control offers adjustable cut-in and cut-out pressures between 1 and 50 psi. The unit can accommodate a remote alarm if the fluid level gets too low. Because it features a commercial-grade diaphragm pump with internal check valve, it eliminates need for a PRV and backflow preventer.
Source: PM Magazine Solar Thermal