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Comparison
Verdict in brief
Both the Weil-McLain Simplicity 110-C and the Weil-McLain Simplicity 199-C belong to the Weil-McLain Simplicity line of combination (combi) boilers. The Weil-McLain Simplicity 110-C is documented at 110 MBH input, 100 MBH output and 95% AFUE, while the Weil-McLain Simplicity 199-C is documented at 199 MBH input, 184 MBH output and 95% AFUE. Weil-McLain Simplicity 199-C lists 89 MBH more input than Weil-McLain Simplicity 110-C (199 MBH against 110 MBH). Both list the same published AFUE of 95%. Weil-McLain Simplicity 199-C lists 26 lb more shipping weight than Weil-McLain Simplicity 110-C (122 lb against 96 lb).
Published manufacturer figures. Input and output are kept separate; blanks mean the manufacturer did not publish that value.
| Specification | Weil-McLain Simplicity 110-C | Weil-McLain Simplicity 199-C |
|---|---|---|
| Input, maximum | 110 MBH | 199 MBH |
| DOE heating capacity | 100 MBH | 184 MBH |
| Efficiency (AFUE) | 95 % | 95 % |
| Turndown | 10:1 | 10:1 |
| Domestic hot water | Integrated combi: built-in DHW module with brazed plate heat exchanger | Integrated combi: built-in DHW module with brazed plate heat exchanger |
| Boiler water content | 2.2 gal | 3.8 gal |
| Weight | 96 lb | 122 lb |
| Dimensions (L x W x H) | 16" x 20" x 34" | 20" x 20" x 34" |
| Venting | 2" or 3" PVC, CPVC, polypropylene or stainless steel (Category IV) | 2" or 3" PVC, CPVC, polypropylene or stainless steel (Category IV); PVC limited to 3" on the 199 |
| Max. equivalent vent/air length | 100 ft in 2" or 3" (vent and air each) | 100 ft in 2" or 3" — 50 ft maximum in 2" for the 199 size |
| Heating water connections | 3/4" NPT male | 1" NPT male |
| Gas connection | 1/2" NPT male | 1/2" NPT male |
| Fuel | Natural gas or propane | Natural gas or propane |
| Net AHRI water rating | 87 MBH | 160 MBH |
| DHW flow at 70°F rise | 2.9 GPM | 5.3 GPM |
| Altitude rating | 2,000 ft | 2,000 ft |
Published ratings: the Weil-McLain Simplicity 110-C is rated 110 MBH input, 100 MBH output and 95% AFUE; the Weil-McLain Simplicity 199-C is rated 199 MBH input, 184 MBH output and 95% AFUE. Weil-McLain Simplicity 199-C lists 89 MBH more input than Weil-McLain Simplicity 110-C (199 MBH against 110 MBH). Both list the same published AFUE of 95%.
Weil-McLain Simplicity 199-C lists 26 lb more shipping weight than Weil-McLain Simplicity 110-C (122 lb against 96 lb). The boiler water content differs: the Weil-McLain Simplicity 110-C lists 2.2 gal, while the Weil-McLain Simplicity 199-C lists 3.8 gal. The dimensions differs: the Weil-McLain Simplicity 110-C lists 16" x 20" x 34", while the Weil-McLain Simplicity 199-C lists 20" x 20" x 34". The venting differs: the Weil-McLain Simplicity 110-C lists 2" or 3" PVC, CPVC, polypropylene or stainless steel (Category IV), while the Weil-McLain Simplicity 199-C lists 2" or 3" PVC, CPVC, polypropylene or stainless steel (Category IV); PVC limited to 3" on the 199.
Both records print the same AFUE (95%), turndown (10:1), domestic-hot-water arrangement (Integrated combi: built-in DHW module with brazed plate heat exchanger) and gas connection (1/2" NPT male), per the cited sources.
Weil-McLain
The Simplicity 110-C is the smallest Simplicity: 110 MBH input, 100 MBH DOE heating capacity and 95% AFUE in a 16 x 20 x 34 inch combi that runs as a combi or heat-only boiler.
Weil-McLain
The Simplicity 199-C is the largest Simplicity: 199 MBH input, 184 MBH DOE heating capacity and 95% AFUE with the line's top DHW flow of 5.3 GPM at a 70°F rise.
The Weil-McLain Simplicity 199-C lists 199 MBH, against 110 MBH on the Weil-McLain Simplicity 110-C, per the cited documentation.
Both list the same AFUE of 95%.
It ships at 122 lb against 96 lb for the Weil-McLain Simplicity 110-C, per the cited sources.
A consultation includes a heat-loss review so the size is right the first time.
On-site service in Greater Vancouver, BC. ROMA lists “Open 7 days” on its site; call to confirm same-day availability.
Sources and verification
Facts checked September 9, 2026. Last updated September 9, 2026. Technical reviewer: not yet assigned.