RSI Boilers

RSI Boilers - Nature's Comfort Authorized Dealer

Outdoor Wood Boilers
Temperature Monitoring
Parts and Accessories
Nature's Comfort Site
Boiler Delivery

Sidearm Heat Exchangers

These 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.


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.







Threaded Ports

1" pex barb - 3/4" sweat $125.00
pex fitting all ports $130.00

 For an additional fee,  elbows, valves, pex fittings, unions,  etc can be pre-installed. Email or call for prices or more info.

Free rental of Pex tool available with purchase. Just pay shipping. Email or call for details.

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