Attack Boiler w/ 550G open storage install

[3fordasho]

Finished boiler overheat protection plumbing and added some storage temperature monitoring. Top to bottom readouts - top of storage, mid tank, and the return line right above the tank. (cheap ebay temp monitors only come with 1m cable for the probe so couldn't reach to the bottom of the tank but the return line temp is more relevant information anyway).

The system has been functional for several weeks now and seems to meet the goals I had for it- the heat output is much greater than the Drolet tundra it replaced and the storage is enough to keep the building above freezing for days (dependent on outside temps of course).
The closed loop is low volume so on start up the heat is available quickly to the fan coil when the storage temps are low.

 

[3fordasho]

One more note on the storage HX- a 100k rated American Solartechnics unit from another member here @tom in maine.
After reading about home brew storage HX's here and noting that many used hundreds of feet of copper tubing- I was a bit skeptical when I first layed my eyes upon Tom's HX - I was expecting more tubing for some reason. I am happy to report that it works as advertised.

 

[SpaceBus]

Maybe the increased surface area from using corrugated piping is the secret? Most homebrew HX's I've seen on the internet are smooth copper pipe.

 

[3fordasho]

Maybe the increased surface area from using corrugated piping is the secret? Most homebrew HX's I've seen on the internet are smooth copper pipe.

Pretty much my thoughts as well, the corrugation and the fact that the stainless is a thinner wall than typical copper tubing.