Title: Works Only OK
Review: This heat trap works only OK. I installed them on my 45 gallon hot water tank, hoping to reduce the heat loss through the pipes. But after I install them, the pipes above the trap still feel hot to the touch. This type of heat trap has a plastic flapper inside, with clearance all around it. So it doesn't really seat completely. The flapper moves in both directions depending the direction of water flow. But nothing really forces the flapper back to closed position when the water stops flowing, not gravity (it weighs nothing), no spring. It can just hang open. It's not the best choice for traping the heat. If I need heat traps again I would buy the ball-type heat trap instead.
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