splitting lines from boiler

[EricO]

So I'm wanting to heat my 1000 gallon storage tank from my biomass 40 boiler. The boiler is in an outside garage, and storage is in house, so I need to pipe the lines underground. I've been thinking about using thermopex, but it only comes in 1-1/4 as its largest diameter. I'm afraid that won't move enough heat to allow my boiler to run full bore since 1-1/4 pex has a max flow of 11.2 I'm thinking I'd need a flow of at least 14.

Another thought was to split a 1.5 inch line and run dual 1" pex lines underground, and then go back to 1.5 once i get to the house. But i didn't know if this is even possible or a good idea. Anyone have similar experience piping from OWB to indoor thermal storage?

 

[foamit up]

I have a Vigas 80 which i piped in 2 inch to storage which is right next to boiler. I then ran to three buildings using a1 1/4" line to each. It works good.
You can run two supply lines in trench and spray foam it. I put plastic liner in trench 6mil, spray about 2 to 3 inches on that., Lay pipe on top of that, spray pipe plus 2-3", cover with plastic. Put in a 3/4 electric conduit (control wire and electric), cover it with dirt.

 

[EricO]

hey thanks foamit up. I plan on doing the spray foam option that you suggested, because it seems to be the least expensive/most effective method. As you mentioned though, you can pipe to storage with the 2 inch pipe, which allows you to transfer all that heat efficiently. If i used the 1-1/4 to run to my storage, i'd only be able to extract about 110,000 btu per hour, and my boiler is supposed to put out 140k. I may have to settle for less, I just really don't want to be idling the boiler.

 

[rkusek]

if you are going to spray foam in trench just get 1.5 instead of 1.25 inch