During this passed winter I installed a Yellow Flame stoker boiler in my garage. The refurb and install are in this thread http://nepacrossroads.com/about32023-60.html
. On page 5 there is a heated debate over sizing the PEX pipe that runs from the boiler to the heat exchanger. From this debate I determined that I should use 1.25" pipe to transfer about 80,000 BTU.
I ended up buying 1" insulated pipe because I was going to move the boiler to the basement and use the 1" pipe to run a heat exchanger in the garage. Now that's changed, I am keeping the boiler in the garage. My first thought was, oh crap I have to buy 1.25" insulated pipe and install it. Then I started thinking about the whole circuit, there is a lot of 1" threaded pipe in the circuit. this leads me to the question.
Since this is a series circuit and there is 1" threaded pipe and 1" heat exchanger pipe in it, will changing the insulated PEX run to 1.25" make any difference?
Top of the boiler has a 1" outlet.
Boiler return is 1.25" reduced to 1" then increased to 1.25". Both of these fittings were on there when I got the boiler so, they were part of the original install in the original house many years ago.
To top it all off, the heat exchanger has 1" inlet and outlet and 1" header pipes.
1" PEX OB with 3/4" PEX non-OB for domestic water.
So, I ask, If I install 1.25" insulated PEX will it make a difference?
If I change the near boiler plumbing to 1.25" with the 1.25" PEX, will that make a difference? Keeping in mind the 1" headers on the heat exchanger.
Thank you for your help,