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[dave_dj1]

I'm kind of surprised no one told him to check his temps on the lines at the boiler and in the house. That would be a sure sign if you are losing a lot of heat in the pipe. If the run is only 15' I wouldn't think there would be much loss unless they are going through some water in the big pipe.
Also if only a 15' run I would go to my nearest Lowes or HD and buy me some 1" pipe and start there.

[Scott7m]

15' of un-insulated would lose quite a bit of btu's. 


Every little bit counts, if you gain a few here, a few there, and get it all as good as you can, you can definitely improve things

[Scott7m]

He's actually very lucky, he can remove the cover on the regular insulated pipe and slide the pex and insulated part through his exsisting pipe. 

[DaveWertz]

Well I went and bought some polyurathane pipe wrap (glorified foam) and wrapped my copper pipes. I let things go for about 3hrs and noticed a 4 degree difference in my house!!! Don't know if I got lucky or what but my blower hasnt kicked on for awhile so it hasnt called for heat in a bit either. Think I am going to try to insulate the PEX next. I think one of my major problems is there is not enough registers in my home  I.E. One per room. Doesn't seem if I went to 1" pipe that it would help much because of the lack of baseboard registers. Just my guess though.

[Scott7m]

See, every little bit counts.  The underground will be another step

But 1" will def move far more btu's

Twice as much water will flow through a 1" line vs 3/4".. Or there about, it's bigger and flows a lot easier

[DaveWertz]

Most of the copper pipe is 3/4" do you think stepping up to 1" PEX would still push more water threw a 3/4" copper pipe? I think the stove needs a good cleaning inside to. My gram failed to shut it completley down in the summer to fully clean it. Im not joking when I say this but there was 1" of soot that I literally pulled off in sheet like chunks off the sides. The bottom I got what I could without getting inside but in the bottom corners there is still a good bit and some liquid creosot also. Looked like tar. I just stirred that around to see if it would burn off. Im sure none of that helps in heating either.

[Scott7m]

Well we don't want to mess with the copper.

You can get underground pex in 3/4", but its hardly any price difference.  If it were all 1" yes it would be better, but having part of it 1" would take "some" resistance out of the system.