RSI Boilers

RSI Boilers - Nature's Comfort Authorized Dealer

Outdoor Wood Boilers
Parts and Accessories
HeatMaster SS Website
Boiler Delivery

Sidearm Heat Exchangers

These copper sidearms are 1.5" dia. with (7) 3/8 tubes inside, 3/4" end ports and 1" side ports. Length of shell is 26". These are true tube and shell as opposed to 1 tube within another.

The stainless models have a single fin enhanced tube that increases the heat transfer 5-8 times better than a smooth pipe.


From the outdoor boiler go to the top one inch port first to get best results.

Combined shipping discounts available. Just email me for a combined rate.




33" Stainless single wall threaded

38" Stainless single wall threaded $175.00

Please Contact us for more info or with any questions
Philip Howard / RSI
109 Commercial St / PO box 341
Arlington, WI 53911
Weather Underground PWS KWIARLIN2