theres a lot of good intel about heating on this site and its helped me answer some ? ive had ,im instaling old chappee boiler and not sure what primary circ conrtol and over temp honeywell to use any help or options and im not sure about bat back-up or no power open zone valve thanks mark
But I am no boiler expert that is for sure. Tell us what you are heating it with. And pics loaded up to show what is going on would be really helpful. A pic can say a thousand words. And can also start the right question being asked, and then .......