Slant/Fin Monitron
Model Number: 8-40 kW
An electric hot water boiler from 8 to 40 kW (about 27,000–137,000 BTU/hr) with no combustion or venting, for homes without gas or oil.
Technical Specifications
Source: manufacturer spec sheet · checked Sep 27, 2026
Some figures come from distributor listings and are still being verified against the manufacturer.
Prices depend on sizing, venting and piping in your home, so we quote every installation.
Sizing: the right size comes from a room-by-room heat-loss calculation, not the size of the old boiler or a rule of thumb. Oversized boilers short-cycle and waste fuel; steam systems are sized to the connected radiation instead. See how we approach boiler installation.
Home-Specific Operating Cost Review
No guaranteed annual savings or payback period
Historical Use
Fuel consumption and weather
Current Rates
Utility and delivered-fuel prices
System Design
Load, piping, controls, and temperatures
Full Specifications
- Model Number
- 8-40 kW
- Efficiency (AFUE)
- Not verified
- Boiler Type
- Electric Boiler
- Fuel
- electric
- Venting
- none
- BTU Input Range
- 27k - 137k BTU
- Domestic Hot Water
- no
- In Production
- Yes
Specifications sourced from the manufacturer spec sheet, checked Sep 27, 2026.
Some figures come from distributor listings and are still being verified against the manufacturer.
Ideal For
Small homes, additions or sites without gas or oil where electric service can support the load.
Expert Review: Slant/Fin Monitron
The Slant/Fin Monitron is an electric hot water boiler that uses resistance elements, so there is no combustion or venting and nearly all the electricity it uses becomes heat. Slant/Fin's ratings sheet lists single-phase models from 8 to 40 kW, or about 27,000 to 137,000 BTU/hr, and the family also includes Monitron II and Deluxe versions. It has no domestic hot water coil. It suits homes without gas or oil, or with limited room for venting. Operating cost depends on local electric rates, which are high on Long Island.
Key Features & Technology
Electric resistance heating
8–40 kW single-phase models
About 27,000–137,000 BTU/hr
No venting or chimney
Monitron II and Deluxe variants
Advantages
- No flue, fuel tank or combustion safety concerns
- Compact and quiet
- Simple installation where power is available
Considerations
- High running cost at typical electric rates
- Large sizes need significant electrical service
- No built-in domestic hot water
Sizing & Installation Notes
Hot water boilers like the Monitron are sized from a room-by-room heat-loss calculation. We never match the old boiler's size — oversized units short-cycle, waste fuel and wear out years early.
Every Slant/Fin installation starts with a free in-home assessment covering the heat-loss calculation, venting and chimney condition, gas or oil supply sizing, and permit requirements for your town. Learn more about our boiler installation process, or see current rebate and incentive programs that may apply.
Warranty & Protection
Parts Warranty
See spec sheet
Heat Exchanger
See spec sheet
Our Guarantee
100% Satisfaction
All Slant/Fin boiler installations by Home+ Air & Heat include our 1-year workmanship warranty, covering labor and any installation-related issues.
Compare the Slant/Fin Lineup
| Model | Efficiency | BTU Range | Fuel | Heat Exchanger Warranty |
|---|---|---|---|---|
| Monitron (this model) | Efficiency not verified | 27k - 137k BTU | electric | — |
| Galaxy GXHA | 81.3% AFUE | 100k - 200k BTU | natural gas/propane | 10-year limited (steam) |
| Lynx | 95% AFUE | 25k - 150k BTU | natural gas/propane | 15 years |
| Sentinel | 82.3% AFUE | 70k - 210k BTU | natural gas/propane | lifetime limited |
| Intrepid Direct Vent | 87% AFUE | 103k - 132k BTU | #2 fuel oil | see Slant/Fin cast-iron boiler warranty |
| Bobcat B-120A/200A | 93% AFUE | 30k - 200k BTU | natural gas/propane | 12-year residential (5-yr full + 7-yr prorated) |
| CHS-85-399 | 95% AFUE | 17k - 399k BTU | natural gas/propane | 15-year residential limited (includes 5-year Protection Plan) |
| Galaxy GX/GXH/GXHA | 81.3% AFUE | 100k - 300k BTU | natural gas/propane | 10-year limited (steam) |
| Intrepid Hot Water | 86% AFUE | 89k - 358k BTU | #2 fuel oil | see Slant/Fin cast-iron boiler warranty |
| Intrepid (steam) | 86% AFUE | 105k - 469k BTU | #2 fuel oil | see Slant/Fin cast-iron boiler warranty |
| Intrepid (water) | 86% AFUE | 105k - 245k BTU | #2 fuel oil | see Slant/Fin cast-iron boiler warranty |
| Victory VSPH | 86.1% AFUE | 60k - 180k BTU | natural gas/propane | lifetime limited |
| Jaguar J-390C | 90.2% AFUE | 390k - 390k BTU | natural gas | — |
| Sentry S-34-210 | 84.4% AFUE | 34k - 210k BTU | natural gas/propane | lifetime limited (verify on certificate) |
| VSL-160C | 92% AFUE | 30k - 160k BTU | natural gas/propane | 15-year residential limited (VSL warranty) |
| Galaxy GG | 84% AFUE | 95k - 399k BTU | natural gas/propane | lifetime limited (hot water models) |
| VSL II | 92% AFUE | 90k - 250k BTU | natural gas/propane | 15-year residential limited (VSL warranty) |
| Lynx LX-85-150 | 95% AFUE | 25k - 150k BTU | natural gas/propane | 15-year residential limited (includes 5-year Protection Plan) |
See the full Slant/Fin brand page for lineup context, or browse the Best Hot Water Boilers 2027 guide to compare across brands.
Frequently Asked Questions
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