In fairness to all, we don't discuss pricing on the Wall. Thanks for your cooperation.
Roll out switch for a boiler without one?
After a recent Carbon Monoxide problem with my boiler which was solved by a very thorough cleaning, my plumber said "It was too bad this boiler does not have a "Roll-out" Switch, which could have shut down the boiler because of the Carbon Monoxide. I asked him to install one on my hydathrem. He said if a boiler does not have one, we can't just put one on it. I have always respected my plumber, but I think it may just be he does not know how to do it. Is this something that Should, Could be done? and if so, how could I (An electrician) do it? Thank you for your help