Canada-wide gas boiler information · On-site service in Greater Vancouver, BC
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Comparison
Verdict in brief
Laars Mini-Therm II JVS-50 and Laars Mini-Therm II JVS-75 are two non-condensing boilers from the Laars Heating Systems Mini-Therm JVS (discontinued) line. Published ratings: Laars Mini-Therm II JVS-50 at 50 MBTU/h input; Laars Mini-Therm II JVS-75 at 75 MBTU/h input. Laars Mini-Therm II JVS-75 lists 25 MBTU/h more input than Laars Mini-Therm II JVS-50 (75 MBTU/h against 50 MBTU/h).
Published manufacturer figures. Input and output are kept separate; blanks mean the manufacturer did not publish that value.
| Specification | Laars Mini-Therm II JVS-50 | Laars Mini-Therm II JVS-75 |
|---|---|---|
| Size / input | 50 MBTU/h | 75 MBTU/h |
| Venting | Natural draft with built-in draft diverter and automatic vent damper | Natural draft with built-in draft diverter and automatic vent damper |
| Water connection | 1-1/4" NPT | 1-1/4" NPT |
| Gas connection | 1/2" NPT | 1/2" NPT |
| Fuel | Natural gas or propane | Natural gas or propane |
| Ignition | Electronic intermittent ignition device (I.I.D.) | Electronic intermittent ignition device (I.I.D.) |
| Dimension A | 13-3/8 in | 13-3/8 in |
| Dimension B | 27-3/4 in | 27-3/4 in |
| Dimension C | 23-5/8 in | 24-1/8 in |
| Dimension D | 21-3/4 in | 21-3/4 in |
| Dimension E | 26-1/2 in | 27-1/2 in |
| Vent diameter | 4 in | 5 in |
Published ratings: the Laars Mini-Therm II JVS-50 is rated 50 MBTU/h input; the Laars Mini-Therm II JVS-75 is rated 75 MBTU/h input. Laars Mini-Therm II JVS-75 lists 25 MBTU/h more input than Laars Mini-Therm II JVS-50 (75 MBTU/h against 50 MBTU/h).
The dimension c differs: the Laars Mini-Therm II JVS-50 lists 23-5/8 in, while the Laars Mini-Therm II JVS-75 lists 24-1/8 in. The dimension e differs: the Laars Mini-Therm II JVS-50 lists 26-1/2 in, while the Laars Mini-Therm II JVS-75 lists 27-1/2 in. The vent diameter differs: the Laars Mini-Therm II JVS-50 lists 4 in, while the Laars Mini-Therm II JVS-75 lists 5 in.
Both records print the same venting (Natural draft with built-in draft diverter and automatic vent damper), water connections (1-1/4" NPT), gas connection (1/2" NPT) and fuel (Natural gas or propane), per the cited sources.
Laars Heating Systems
The Laars Mini-Therm II JVS-50 is a discontinued 50 MBTU/h non-condensing residential hydronic boiler with electronic intermittent ignition (I.I.D.), 1-1/4 in water connections and a 4 in vent.
Laars Heating Systems
The Laars Mini-Therm II JVS-75 is a discontinued 75 MBTU/h non-condensing residential hydronic boiler with electronic intermittent ignition (I.I.D.), 1-1/4 in water connections and a 5 in vent.
The Laars Mini-Therm II JVS-75 lists 75 MBTU/h, against 50 MBTU/h on the Laars Mini-Therm II JVS-50, per the cited documentation.
Both list the same venting, water connections, gas connection and fuel, 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.