Work good for emergency back ups as well lol, boiler auto fill valve stopped working, I back filled it through the flush valve on the bottom and a rust hole on the expansion tank blew out before I got half the pressure I needed, so I broke down and called a guy I know that dose hvac, I had already ordered the parts I needed but couldn't wait another day for them to come, at some point he turned the pilot off for something and when he went to turn it back on the gas valve was stuck off, at this point it's after 5 everything's closed and I'm looking at 0 temps with no heat, a couple box fans to circulate the air and my old ventless garage heater save the day kept the upstairs 70 all night
