How does the Comfort UP hot water circulation pump work?
Grundfos “Comfort” series hot water circulation pumps work in the following manner: Please note: Unlike the diagram above, the Grundfos UP15-10S “Comfort” series hot water system works in the following manner: The comfort valve is installed under the faucet farthest from the water heater. The UP 15 series recirculation pump moves the hot water from the heater throughout the pipe back to the heater through the cold water line. As the water heats up at the comfort valve, it closes. When a faucet is turned on, warm water is instantly available for use with no waste. “I have multiple hot water branches. If I use the UP15-10S series, how will I get water to all branches?” You can order additional comfort valves for each branch. “I’d like to have hot water without much of a wait. How can I do this?” The two easiest solutions are: A) A tankless water heater at the source. B) A hot-water recirculation system. This consists of a small pump and a return line from your farthest fixture. The pump
