CB says yes for warranty. My OWB was bought slightly used so no warranty but CB's requirement is reportedly to reduce sweat on the boiler that can induce rusting if the fire goes out.
My dealer says he never installs them on his. The previous owner never installed it. It was still hanging on the screw under the boiler where it is placed in shipping.
Seems everyone is using them. But it does incur an install cost of (2) 1/4 turn valves, 2
water boiler spigots (I assume to test troubleshoot if it becomes inoperable). (2) T pipe fittings, etc. if installed as pictureds on CB sheets.
Thoughts?