After 1 1/2 years of working on and off on my boiler project I created fire in my EFM 520. Beautiful unit. So long OPEC. I will post many photo's and tell about my adventures in transforming our Horse barn into a Coal Boiler Building. It's 110' away form our house.
Stokerman Thank You. Plug installed The reason the valve was installed instead of of low water cutoff I had a family of mice take up residence through the 3/4" vent valve hole, I had It taped but they like DUCT tape. I don't see the 1"pipe size being a problem. My oil boiler is a 90,000 BTU unit running through 11/4" copper. If it is I'll deal with that issue another time.
AA130FIREMAN thanks for the info. I'm thinking I may not run the boiler much above 160 or 170. I have radiant heat with 1 loop set @140 degree's. That takes care of the house although without the oil boiler in the basement running I'll have to add some baseboard heat this summer. I also have an indirect 40 gal hot water tank set @ 130.Time will tell. Thank God no more oil. !!!!!!!!!!!
I believe you would want a pump and a flo check on the bypass loop between the supply and return (whats to stop the cold return water from going directly to the supply?). I believe Sting will give some more insightfull information