Canada-wide gas boiler information · On-site service in Greater Vancouver, BC
Boilers.ca is a brand of ROMA Heating & Cooling · Licensed gas contractor LGA0202903
Comparison
Verdict in brief
The Laars Mini-Therm II JVS-100 and Laars Mini-Therm II JVS-125 are both non-condensing boilers in the Laars Heating Systems Mini-Therm JVS (discontinued) line. Published ratings: Laars Mini-Therm II JVS-100 at 100 MBTU/h input; Laars Mini-Therm II JVS-125 at 125 MBTU/h input. Laars Mini-Therm II JVS-125 lists 25 MBTU/h more input than Laars Mini-Therm II JVS-100 (125 MBTU/h against 100 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-100 | Laars Mini-Therm II JVS-125 |
|---|---|---|
| Size / input | 100 MBTU/h | 125 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 | 16-7/8 in | 16-7/8 in |
| Dimension B | 28-3/4 in | 28-3/4 in |
| Dimension C | 24-1/8 in | 23-5/8 in |
| Dimension D | 22-3/4 in | 22-3/4 in |
| Dimension E | 27-1/2 in | 27-1/2 in |
| Vent diameter | 5 in | 6 in |
Published ratings: the Laars Mini-Therm II JVS-100 is rated 100 MBTU/h input; the Laars Mini-Therm II JVS-125 is rated 125 MBTU/h input. Laars Mini-Therm II JVS-125 lists 25 MBTU/h more input than Laars Mini-Therm II JVS-100 (125 MBTU/h against 100 MBTU/h).
The dimension c differs: the Laars Mini-Therm II JVS-100 lists 24-1/8 in, while the Laars Mini-Therm II JVS-125 lists 23-5/8 in. The vent diameter differs: the Laars Mini-Therm II JVS-100 lists 5 in, while the Laars Mini-Therm II JVS-125 lists 6 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-100 is a discontinued 100 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.
Laars Heating Systems
The Laars Mini-Therm II JVS-125 is a discontinued 125 MBTU/h non-condensing residential hydronic boiler with electronic intermittent ignition (I.I.D.), 1-1/4 in water connections and a 6 in vent.
The Laars Mini-Therm II JVS-125 lists 125 MBTU/h, against 100 MBTU/h on the Laars Mini-Therm II JVS-100, 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.