* This is my fist time on this site (and second post today), I can not find the first post to edit or delete, So I am re-posting in hopes of getting some feedback from you all.
First, I apologize if you find identical post without radiator and old furnace pictures, I hope that radiator pictures would help to get better feedback.
Currently we have steam boiler that is about 70 yeas old. We live in North East Connecticut (it gets pretty cold and windy some days and), we spend lots of money on oil. We would like to convert to water radiator system for few reasons. 1) Steam boiler use more oil to build steam, 2) with Steam heat we cannot use Zone heating, 3) Steam boiler is so old and in efficient and not helping the home value.
(furnace pictures are attached to show you how old it is. It must have been a coal burning boiler converted to oil. Distance between oil fire to the boiler is about 3 feet )
I have found a oil based furnace ( that would be able to heat the radiators with hot water.) Furnace is Burnham MPO-IQ147-TB (112,000 BTU Output Oil Fired High Efficiency 3-Pass Boiler), with direct venting and runs about 87% efficiently, per Burnham documentation. New furnace will be installed by a licensed professional, and he or she will connect 2 main pipes and circulator, Zone wiring etc.
Below are my questions:
1) based on what I was able to find on the web, I can convert the radiators from steam to hot water. with some modifications (such as removing and plugging the steam radiators air vents, and all the radiator heaters have screws on place to add bleed valves, and I will have to run all the return pipes from each radiator)
* Please note that Radiator1 intake side or return side is not reinforced like the radiator 2 intake or return side. (highlighted with arrow, -->picture "R2ReturnSide") So I am working with two different types of radiators. I know for sure "Radiator type 2 " definitely can be converted to hot water. I am not confident about the "radiator type 1"
What else can I do to be 100% certain that, I can convert both types of radiators to hot water radiators?
2) I intend to remove bunch of large metal pipes (almost all, all over the basement) and replace with AL-PEX-AL pipes connecting to the radiators. What size pex tubes should I use to feed the radiator with hot water, and what size pipes should I use for return hot water from each radiator (please note, pipes I am referring to in this question are going to the radiators from each Zone Valves)
3) what is the best practice? do you install the Zone valves on feeding side or return side?
4) The way I have seen so far one large pipe from furnace connect to the zoning pipes. Assuming I use Zone heat (with smaller pipes, Intend to have zoning for three floors) what size copper pipe should I use to feed hot water from the furnace to the Zone pipes? What size copper pipe should I use for all the return zone pipes to connect to the furnace?
5) Having the furnace installed, circulator pump installed (circulator pump that is suitable for three floors. including the basement.) and connecting the 2 main pipes to the furnace by a professional.
Would it be best,and safe to have water pressure to be about 20 PSI, and about 180 Fahrenheit (I will be using best AL-PEX-AL pipes for this project?
6) We have a brick chimney that is currently being used by the old steam furnace. The new furnace has capability of using direct vent. Should it best to use the direct vent option? How much would it cost to have direct venting to be installed? or is it best to use the existing chimney?
Please help me out with the information, , I have not been able to find out on the web yet, thank you all in advance!!