Lochinvar Knight 199K Combi Boiler Water Heater
Model WHN199
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Btu
199000
Fuel Type
Natural Gas
Tank Type
Tankless
Energy Factor
0.95
Flow Rate Gpm
5
Warranty Years
10
Lochinvar Knight 199K Combi Boiler Water Heater Review
The Lochinvar Knight 199K Combi Boiler Water Heater is the larger variant in Lochinvar's KNIGHT residential combi line. 199K BTU sized for medium-large homes (2,000-3,000 sq ft).
Specs: 199,000 BTU input, AFUE 95% (condensing), 5.5 GPM DHW at a 70°F rise, modulating burner with 6:1 turndown ratio, stainless steel heat exchanger, PVC condensing venting. 15-year warranty on heat exchanger.
The KNIGHT 199 is right-sized for medium-large homes converting from aging boiler + separate water heater. About $9,000-$11,500 installed depending on hydronic system modifications.
Right buyer: medium-large home in markets with established Lochinvar dealer presence wanting premium combi with hydronic specialist engineering.
Pros
- On-demand operation at 5 GPM — no standby heat loss; unlimited hot water if demand is within flow-rate capacity
- UEF 0.95 — top-tier efficiency; qualifies for Inflation Reduction Act §25C residential credit
- 10-year warranty — solid above-average coverage for this class
Cons
- Requires dedicated 199K BTU gas supply line — undersized gas piping is the leading cause of flow-rate shortfalls
Full Specifications
Brand
Lochinvar
Model Number
WHN199
Btu
199000
Fuel Type
Natural Gas
Tank Type
Tankless
Energy Factor
0.95
Flow Rate Gpm
5
Warranty Years
10
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