Lochinvar · Knight Floor Mount (KHB)
Lochinvar Knight KHB199
The Knight KHB199 is the 199 MBH floor-standing Knight: 19.9 to 199 MBH input at 95% AFUE with 183 MBH DOE capacity, 1-1/4" connections and 3" venting.
Key figures
- Max input
- 199 MBH
- Max CSA output
- —
- AFUE
- 95 %
- Min input
- 19.9 MBH
Input is gas energy consumed; output is heat delivered. Never size from input alone.
Lochinvar Knight KHB199 in practice
The KHB199 matches the wall-hung WHB199 in the ratings table — 19.9 to 199 MBH of input, 183 MBH of DOE heating capacity and a 159 MBH AHRI net rating at 95% AFUE — for projects that want that capacity on the floor rather than on a wall. Large homes and small multi-suite buildings whose heat loss approaches 200 MBH are its territory.
Water fittings step up to 1-1/4" and water content to 5.2 gallons, with the gas connection remaining 1/2". Venting is 3" to 100 equivalent feet, and the boiler stays heating-only with domestic hot water from an indirect tank such as the Squire, orchestrated by the SMART SYSTEM control.
Best suited to
- Large homes and small multi-suite buildings with loads near 200 MBH
- High-recovery indirect-tank systems on a floor-standing platform
- Projects planned around 1-1/4" near-boiler piping
Applicability and support
- Model number
- KHB199L
- Canadian availability
- available
- Production status
- current
- ROMA supplies
- Confirmed at consultation
- ROMA services
- Confirmed at consultation
- Warranty
- Series terms
Where ROMA provides on-site service
On-site service is currently offered in Greater Vancouver, BC, including Vancouver, Burnaby, Richmond, Surrey, Coquitlam, North Vancouver, West Vancouver, New Westminster, Port Coquitlam, Port Moody, Delta, Langley, Maple Ridge, Abbotsford, Chilliwack, White Rock, Pitt Meadows, Tsawwassen, Anmore, Lions Bay, Belcarra, Bowen Island, Mission. Everything else on this site is reference information you can use anywhere in Canada.
Specifications
Published specifications
Values as published by Lochinvar. Units are shown with every value; notes flag conflicting sources or missing figures.
| Specification | Value | Note |
|---|---|---|
| Input | ||
| Heating input, minimum | 19.9 MBH | Per the I&O ratings table. |
| Heating input, maximum | 199 MBH | Per the I&O ratings table. |
| Output | ||
| DOE heating capacity | 183 MBH | DOE heating capacity per the I&O ratings table. |
| AHRI net water rating | 159 MBH | Net AHRI rating based on a piping and pickup allowance of 1.15. |
| Efficiency | ||
| Efficiency (AFUE) | 95 % | 95% AFUE per the I&O ratings table. |
| Domestic hot water | ||
| Domestic hot water | Heating-only boiler | Pairs with the Squire indirect water heater or another indirect tank; the Knight is heating-only. |
| Venting and air | ||
| Venting | Category IV sealed combustion; PVC, CPVC, polypropylene or stainless steel | In Canada, plastic venting must be a ULC S636-certified system. |
| Max. equivalent vent/air length, 3" | 100 ft | Table 3D (air intake/vent piping sizes), I&O manual. |
| Physical and connections | ||
| Water content | 5.2 gal | Per the I&O ratings table. |
| Space-heating water connections | 1-1/4" | Per the I&O ratings table. |
| Gas connection | 1/2" | Per the I&O ratings table. |
Manuals
Alerts documented for this model
- Gas Pressure SW
- Flow Switch/LWCO
- Air Pressure SW
- Too Many Recyclings
- Anti-cycling
- Flame Fail Ign
- Flame Sequence
- Outlet ARHL
- Outlet MRHL
- Fan Speed
- Inlet, Outlet, or Flue Sensor Fault
- AUX Contact Sw
- Outlet Temp Diff
- Fatal Error
- Memory Error
- Flue Temp High / Flue Temp Limit
- Delta T High / Delta T Limit
- Outlet Temp High / Outlet Temp Limit
- Low 24 vac
- Watch Dog Error
- Write EEProm
- CRC Parameters
- No Error Stored
Frequently asked questions
What distinguishes the KHB199 from the KHB155?
Input rises from 15.5-155 MBH to 19.9-199 MBH, DOE capacity from 144 to 183 MBH, connections from 1" to 1-1/4" and water content from 3.2 to 5.2 gallons.
Does the KHB199 make domestic hot water?
No. It is heating-only; domestic hot water comes from an indirect tank connected to the system, and the SMART SYSTEM provides the tank thermostat and sensor functions.
Questions about the Lochinvar Knight KHB199?
Describe what the boiler is doing and get a straight answer about the next step.
On-site service in Greater Vancouver, BC. ROMA lists “Open 7 days” on its site; call to confirm same-day availability.
Sources and verification
- Lochinvar — Knight Fire Tube Floor Mount (KHB055L) model page · accessed September 7, 2026
- Knight Fire Tube Boiler (KHB055-285) I&O Manual, Rev M · Rev M · accessed September 7, 2026
Facts checked September 7, 2026. Last updated September 7, 2026. Technical reviewer: not yet assigned.