I was B Tagged by Arrow for high CO emissions because the gaskets needed replacing. The only option they provided was to upgrade to a higher efficiency boiler. I never received a response to my requests for a quote to replace the gaskets or a rental option. I contacted other contractors through Homestar for a second option and canvas my options. Thanks to Homestar I found a contractor who repaired/replaced my gaskets and removed by B Tag for a fraction of the costs of replacing my boiler. I am disappointed that Arrow put my wife and I in a stressful situation without full disclosure and discussions of all our options.