Canada-wide gas boiler information · On-site service in Greater Vancouver, BC
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Comparison
Verdict in brief
Laars Rheos+ RHHH 1200 and Laars Rheos 1600 are two boilers from the Laars Heating Systems Rheos (discontinued) line. Published ratings: Laars Rheos+ RHHH 1200 at 1,200,000 BTU/hr input; Laars Rheos 1600 at 1,600,000 BTU/h input. Laars Rheos 1600 lists 400,000 BTU/hr more input than Laars Rheos+ RHHH 1200 (1,600,000 BTU/hr against 1,200,000 BTU/hr).
Published manufacturer figures. Input and output are kept separate; blanks mean the manufacturer did not publish that value.
| Specification | Laars Rheos+ RHHH 1200 | Laars Rheos 1600 |
|---|---|---|
| Input | 1,200,000 BTU/hr | 1,600,000 BTU/h |
| Water inlet / outlet | 2-1/2" NPT | 2-1/2" NPT |
| Gas connection (standard pack) | 1" NPT | 1-1/2" NPT |
| Vent outlet connection | 6 in | 6 in |
| Air inlet connection | 6 in | 8 in |
| Altitude | To 10,000 ft (universal altitude) | To 10,000 ft without high-altitude modification |
Published ratings: the Laars Rheos+ RHHH 1200 is rated 1,200,000 BTU/hr input; the Laars Rheos 1600 is rated 1,600,000 BTU/h input. Laars Rheos 1600 lists 400,000 BTU/hr more input than Laars Rheos+ RHHH 1200 (1,600,000 BTU/hr against 1,200,000 BTU/hr).
The gas connection differs: the Laars Rheos+ RHHH 1200 lists 1" NPT, while the Laars Rheos 1600 lists 1-1/2" NPT. The air inlet connection differs: the Laars Rheos+ RHHH 1200 lists 6 in, while the Laars Rheos 1600 lists 8 in. The altitude differs: the Laars Rheos+ RHHH 1200 lists To 10,000 ft (universal altitude), while the Laars Rheos 1600 lists To 10,000 ft without high-altitude modification.
Both records print the same water connections (2-1/2" NPT) and vent outlet connection (6 in), per the cited sources.
Laars Heating Systems
The Laars Rheos+ RHHH 1200 is a discontinued condensing commercial hydronic boiler at 1,200,000 BTU/hr input, with a 6" vent outlet, 6" air inlet, 2-1/2" NPT water connections and a 1" NPT standard gas connection.
Laars Heating Systems
The Laars Rheos 1600 is a discontinued commercial modulating boiler at 1,600,000 BTU/h input, with a 6 in vent outlet, 8 in air inlet, 2-1/2" NPT water connections and a 20°F-rise flow of 139 gpm.
The Laars Rheos 1600 lists 1,600,000 BTU/h, against 1,200,000 BTU/hr on the Laars Rheos+ RHHH 1200, per the cited documentation.
Both list the same water connections and vent outlet connection, 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.