Canada-wide gas boiler information · On-site service in Greater Vancouver, BC
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Comparison
Verdict in brief
The NRCB180DV and NRCB199DV are the two Noritz NRCB combis and are the same physical unit: both weigh 95 lb in an 18.5 x 27 x 12.8 in cabinet, fire from the same 18 MBH minimum on heating and DHW, are rated 95.0% AFUE and share connections and venting. The 199DV alone adds headroom — 120 MBH heating input against 100 MBH and 199,900 BTU/h DHW input against 180,000, with DHW flow to 11.1 GPM instead of 9.8.
Published manufacturer figures. Input and output are kept separate; blanks mean the manufacturer did not publish that value.
| Specification | Noritz NRCB180DV | Noritz NRCB199DV |
|---|---|---|
| Heating input, minimum | 18 MBH | 18 MBH |
| Heating input, maximum | 100 MBH | 120 MBH |
| DHW input, minimum | 18 MBH | 18 MBH |
| DHW input, maximum | 180 MBH | 199.9 MBH |
| Efficiency (AFUE) | 95 % | 95 % |
| Weight | 95 lb | 95 lb |
| Width | 18.5 in | 18.5 in |
| Height | 27 in | 27 in |
| Depth | 12.8 in | 12.8 in |
| Venting | Sealed combustion direct vent; 2" or 3" PVC, CPVC, polypropylene or stainless steel | Sealed combustion direct vent; 2" or 3" PVC, CPVC, polypropylene or stainless steel |
| Heating water connections | 1" in / 1" out | 1" in / 1" out |
| Domestic hot water connections | 3/4" in / 3/4" out | 3/4" in / 3/4" out |
| Gas connection | 3/4" NPT | 3/4" NPT |
Both models are the same wall-hung condensing combi: 95 lb at 18.5 x 27 x 12.8 in, rated 95.0% AFUE, with 316L stainless steel primary and secondary heat exchangers, 1" heating water connections, 3/4" DHW and gas connections, and the same 2"-or-3" sealed combustion direct vent options (ULC S636-certified plastic venting in Canada). Noritz markets both for simultaneous DHW and space heating.
Minimum fire is identical at 18,000 BTU/h on both the heating and DHW sides, so in a low-load home the two boilers modulate the same way. The published differences sit at the top of the ranges: heating input reaches 100 MBH on the 180DV against 120 MBH on the 199DV, and the standard (DHW) input reaches 180,000 BTU/h against 199,900 BTU/h.
Because the cabinet and minimum fire do not change, the 199DV costs nothing in low-fire behaviour or installation footprint; the decision follows the room-by-room heat-loss calculation and the household's hot-water demand. A load that approaches 100 MBH of heating or heavy simultaneous hot-water draws is where the 199DV's extra ceiling earns its place.
Noritz
The Noritz NRCB180DV (GHQ-C2801WX-FF US) is a wall-hung condensing combi boiler rated 95.0% AFUE: it fires 18,000 to 100,000 BTU/h for space heating and up to 180,000 BTU/h for domestic hot water, in a 95 lb, 27-inch-tall cabinet Noritz markets for simultaneous DHW and heating.
Noritz
The Noritz NRCB199DV (GHQ-C3201WX-FF US) is the larger NRCB condensing combi: 18,000 to 120,000 BTU/h of heating input with DHW input to 199,900 BTU/h and flow to 11.1 GPM, rated 95.0% AFUE in the same 95 lb cabinet as the NRCB180DV.
No. Both weigh 95 lb and measure 18.5 x 27 x 12.8 in, with the same connections and venting. Only the maximum heating and DHW inputs differ.
Heating input tops out at 100 MBH on the 180DV versus 120 MBH on the 199DV, and DHW input at 180,000 BTU/h versus 199,900 BTU/h, with DHW flow published to 9.8 and 11.1 GPM respectively.
When the heat-loss calculation approaches 100 MBH of heating input or the household's hot-water draws press against the 180,000 BTU/h DHW ceiling. Below those loads, the two boilers behave identically.
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.