RSI Boilers

RSI Boilers - HeatMaster SS and Nature's Comfort Authorized Dealer

Outdoor Wood Boilers
Temperature Monitoring
Parts and Accessories
HeatMaster SS Website
Boiler Delivery

Parts and Supplies

Boiler Treatment Water Treatment

Description Price
Nature's Comfort Treatment (See below for treatment ratios)
1 Quart Bottle
1/2 Gallon Bottle $38.00
Case of treatment (12 one qt bottles, 12 quarts total) $210.00
Case of treatment (6 half gallon bottles, 12 quarts total) $200.00
Treatment test kit $20.00

1000-1500ppm (500ppm min.) of Nitrite concentration must be maintained at all times.1 cup/100gal = 200ppm, 2qt/100gal = 1,600ppm
Initial treatment ratios needed for: NCB-80: 0.5gal, NCB-120: 0.75gal, NCB-175: 1.00, NCB-250 & GT6000: 1.25gal,NCB-275G: 1.5gal, NCB-325G: 1.75gal, NCB-400G: 2gal

Nature's Comfort treatment can be used in any outdoor boiler made of mild steel

HeatMaster Treatment
Certified Boiler treatment gallon jug (treats up to 300 gallons)
Certified treatment can be used on any outdoor boilers made of stainless steel.
Rope Seal
Rope Seal
Description Price
1" rope seal Price per foot.
600 degree silicone 10.2 oz tube (Black) $9.50
Fire Brick
Fire Brick
Description Price
Fire Brick for NCB Boilers $13.00
Fire Brick for GT and NCB coal Boilers $7.25
Boiler Parts
These are just some of the more common parts. All other parts available, call or email.
Draft SolenoidDraft BLowerAsh Pan Latch
Description Price
Honewell Mechanical Aquastat w/drywell $105.00
Honewell Mechanical Aquastat w/o drywell $90.00
Digital Aquastat (HeatMaster MF and C series & NCB GT series) $100.00
Digital Aquastat Upgrades for NCB. several options available. Call or email
Brass Drywell - 1/2" threads $15.00 
Air Shutoff Solenoid. 7# lift $36.00
148 CFM Draft Blower (MF5000NCB 120-250, HM MF5000 ) $85.00
273 CFM Draft Blower (MF10000 & NCB 325G) $115.00
30-250°F Gauge $20.00
Digital Thermometer (red LED with 1/4" diameter round probe) Drywell $10 extra. Requires 5v power (old cell charger, etc) $30.00
Ash Pan Latch Kit $10.00
Solar Motion Light $18.00
GT Boiler Damper Actuator 12v (requires battery upgrade if existing is still original 24v) $75.00
Battery Backup system for GT damper actuator $56.00

24v AC 2 pole 10A contacts for GT boiler

Call or email for any other Nature's Comfort or HeatMaster parts.  
Chimney cap
Description Price
Class A Double wall Stainless Chimney
Fits Nature's Comfort and HeatMaster boilers
Prices subject to change without notice
6" x 18" $100.00
6" x 36" $140.00
6" x 48" $175.00
6" cap $70.00
8" x 18" $175.00
8" x 36" (G400 boiler uses 8") $200.00
8" x 48" $225.00
8" cap $100.00

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