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Laars Heating Systems · Series
The Mini-Therm II JVS is Laars' discontinued non-condensing residential gas-fired hydronic boiler with electronic intermittent ignition (I.I.D.), built in sizes 50, 75, 100, 125, 160 and 225 MBTU/h. Laars lists the JVS/JVT installation manual on its discontinued-documents index.
Series facts
The Mini-Therm II JVS is one of the two ignition configurations of Laars' Model JV copper-tube hydronic boiler line: the JVS uses an electronic intermittent ignition device (I.I.D.), while the JVT uses a thermocouple with a continuous burning pilot. The 1025Y installation manual covers both at sizes 50-225, and the matching parts list prints the twelve model columns JVS-50, JVT-50, JVS-75, JVT-75, JVS-100, JVT-100, JVS-125, JVT-125, JVS-160, JVT-160, JVS-225 and JVT-225.
The dimensional table gives six cabinet sizes in inches — the 50 at 13-3/8 by 27-3/4 with a 4 in vent, stepping up to the 225 at 25-5/8 by 31-1/2 with a 7 in vent — with 1-1/4 in water connections on every size and 1/2 in gas connections except the 3/4 in natural-gas connection on the 225. The boilers are natural-draft with a built-in draft diverter, an automatic vent damper (standard on U.S. and Canadian models; a metal plug is used on the JVS damper plate, and the JVT damper plate hole is never blocked) and an optional side-wall power venter.
The manual prints no input, output or AFUE rating table: the size number is the input in MBTU/h, and the temperature-rise and flow tables in Section 8 are based on the "Normal Input Rate from the rating plate". Laars' discontinued-documents index lists the Mini-Therm II JVS/JVT installation manual and parts list, and the Document Library files them under Discontinued Documents. The Canadian warranty sheet (Document 8023) covers residential gas boilers other than the Mascots and NeoTherm.
Highlights
Models
One canonical page per model with input, output and efficiency kept separate.
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.
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.
Laars Heating Systems
The Laars Mini-Therm II JVS-160 is a discontinued 160 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.
Laars Heating Systems
The Laars Mini-Therm II JVS-225 is a discontinued 225 MBTU/h non-condensing residential hydronic boiler with electronic intermittent ignition (I.I.D.), 1-1/4 in water connections and a 7 in vent.
| Specification | Laars Mini-Therm II JVS-50 | Laars Mini-Therm II JVS-75 | Laars Mini-Therm II JVS-100 | Laars Mini-Therm II JVS-125 | Laars Mini-Therm II JVS-160 | Laars Mini-Therm II JVS-225 |
|---|---|---|---|---|---|---|
| input-min | — | — | — | — | — | — |
| Size / input | 50 MBTU/h | 75 MBTU/h | 100 MBTU/h | 125 MBTU/h | 160 MBTU/h | 225 MBTU/h |
| output-max | — | — | — | — | — | — |
| afue | — | — | — | — | — | — |
| turndown | — | — | — | — | — | — |
| vent-max-3 | — | — | — | — | — | — |
| vent-max-2 | — | — | — | — | — | — |
| weight | — | — | — | — | — | — |
Read the full comparison: Laars Mini-Therm II JVS-50 vs JVS-75 →
Read the full comparison: Laars Mini-Therm II JVS-75 vs JVS-100 →
Read the full comparison: Laars Mini-Therm II JVS-100 vs JVS-125 →
Read the full comparison: Laars Mini-Therm II JVS-125 vs JVS-160 →
Error codes and alerts
No alerts documented for this series yet.
Manuals
Where ROMA provides on-site service
On-site service is currently offered in Greater Vancouver, BC, including Vancouver, Burnaby, Richmond, Surrey, Coquitlam, North Vancouver, West Vancouver, New Westminster, Port Coquitlam, Port Moody, Delta, Langley, Maple Ridge, Abbotsford, Chilliwack, White Rock, Pitt Meadows, Tsawwassen, Anmore, Lions Bay, Belcarra, Bowen Island, Mission. Everything else on this site is reference information you can use anywhere in Canada.
Services for Laars Heating Systems boilers
The JVS uses an electronic intermittent ignition device (I.I.D.) while the JVT uses a thermocouple with a continuous burning pilot, per the introduction of Document 1025Y. Both are otherwise the same Model JV copper-tube hydronic boiler.
The manual covers sizes 50-225, and the parts list prints the JVS model columns at 50, 75, 100, 125, 160 and 225 MBTU/h.
Yes. Laars' discontinued-documents index lists the Mini-Therm II JVS/JVT install and operating manual and parts list, and the Document Library files them under Discontinued Documents.
Describe what the boiler is doing and get a straight answer about the next step.
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.