I had my Intellidyne HW 3250 Way before I had 2 boilers. This devise guarantees a 10% savings with a $$$ back guarantee. I have found it priceless in the integration of my pellet boiler helping to make them work better "together" It "holds off the firing of my oil boiler in most cases except when it is very cold and I am recovering temps from my 11 DEEP set back thermostats. During this time BOTH boilers work in conjunction with each other to limit runtime on circulators (circulate at a higher temp) As of 2/28/2014 this season my oil burner has just gone over 20 hours run time (tracked by intellidyne )....that equals 17.8 gallons of heating oil (.75 nozzle X..20 hours X .89{actual gallons/hr @ 140 psi}) I can live with that. and my system is completely automatic...
