Welcome! Here are the website rules, as well as some tips for using this forum.
Need to contact us? Visit https://heatinghelp.com/contact-us/.
Click here to Find a Contractor in your area.

Adding additional safety to mod-cons

dave123 Member Posts: 67
Curious what additional safety devices people here are adding to a typical mod-con boiler. Seems they all come with internal monitoring of water temp and pressure, exhaust gas temp, etc. Most seem to also have wiring for a separate LWCO, and then of course there is the PRV.

Is this enough? Ideally there should be redundancy. Just wondering what people here add, if anything, to get to a good level of safety. Or are the newer mod-cons, as designed, good to go?


  • Tinman
    Tinman Member Posts: 2,808
    I think they’re ready to go as is with the addition of the LWCO, which is a good idea on any boiler. 
    Steve Minnich
    JUGHNE Member Posts: 11,021
    In addition to the LWCO, I put a temp/pressure gauge on the system inlet and outlet at the closely spaced tees.
  • EzzyT
    EzzyT Member Posts: 1,290
    I always install a surge protector and CO detector with relay on the line voltage side before the main switch of the boiler. 
  • clammy
    clammy Member Posts: 3,092
    I ll add to the list if all low temp radiant and wood floors a manual reset hi temp , they used to be pretty common but I rarely see them install much there s nothing worse then damaging a wood floor from hi temp and no one home . Seen it and it wasn’t pretty 10 s of thousands of dollars damage when a simple manual or even resettable limit to either shut the pump or that zone off . The surge protector on mod cons is a no brained and wouldn’t be a bad idea for standard boilers and ecm pumps . Not to get crazy but I ve seen drain pan kits for wall hung boiler nice idea mount right to the wall under the unit and pipe the drain to a indirect waste line ,having wet switches in pans and on condensate pumps wired to audio alarms is also another idea especially when faced w 2 floor mechanical rooms and the possibility for water damage . There’s always a better mouse trap just have to make sure your covering all your bases . Peace and good luck clammy
    R.A. Calmbacher L.L.C. HVAC
    NJ Master HVAC Lic.
    Mahwah, NJ
    Specializing in steam and hydronic heating