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Time for a new oil boiler?
I currently heat my 10 year old home with a Laars Pro-Max low mass 3 pass 140BTU Gross oil boiler. It was originally a powervent application but I installed a chimney in 2011 and connect the boiler while leaving the outside air kit. I had the boiler serviced annually by my oil company and the technician would always suggest to replace it, yet it has never failed me! In 2013, I personally rebuilt my heating system and included an Econoburn Wood boiler plumbed parralel to the oil boiler. See schematic.
So, during the 2013 summer season, the oil boiler sat dormant while I heated domestic water via a used electric water heater. I didn't have it serviced. It fired right back up after I completed the renovation and heated my house during the winter months when the wood boiler wasn't in use. I also installed an electric/hybrid water heater as a secondary HW source to my indirect.
Jump forward to today. I'm primarily using the electric/hybrid water heater to heat DHW during the summer as I calculated it to be cheaper than heating the indirect with oil. So, again, the oil boiler has sat dormant for roughly 4 months. I figured it was time to have the boiler serviced. He called me while I was at work and suggested I come home to see how bad the unit has gotten.
The was severe dampness inside the boiler where it has corroded and combined with the water, scale, & soot, it has created a nasty "muck". Witnessing this led me to agree with the guy that it's time to replace the boiler.
My current setup has boiler return protection for the wood boiler but doesn't on the oil. I'm sure this has been adding to the cause. In addition, although I run dehumidifiers in the basement, I wonder if the outside air kit on the burner is drafting damp, humid air through the boiler while the chimney is pulling?
So, Any suggestions on a replacement? Something with built-in return water protection, doesn't need an outside air kit, & would people suggest a low water temp to maintain boiler temp. 100 deg or so.
I've been looking at the Weil-Mclain Ultra & the Burnham MPO-IQ