Canada-wide gas boiler information · On-site service in Greater Vancouver, BC
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Comparison
Verdict in brief
The NTH150 and NTH210 are the middle and upper steps of the NeoTherm Residential ladder — the 150 and 210 columns of Document 1252K — the same modulating condensing boiler with shared Hold/Lockout diagnostics, differing in size and the heavier blower, heat exchanger and gas train of the larger column.
Published manufacturer figures. Input and output are kept separate; blanks mean the manufacturer did not publish that value.
| Specification | Laars NTH150 | Laars NTH210 |
|---|---|---|
| Maximum input (as printed) | 150 MBH | 210 MBH |
| Fuel | Natural gas or propane | Natural gas or propane |
| Domestic hot water | Boiler model — the control's error table includes DHW high-limit (80) and DHW sensor (93) entries per Appendix B | Boiler model — the control's error table includes DHW high-limit (80) and DHW sensor (93) entries per Appendix B |
| Error reporting | Numeric codes reported as Hold (H) or Lockout (L) — Appendix B of the I&O manual (Document 1252K) and Appendix 1 of the service manual (Document 1291) | Numeric codes reported as Hold (H) or Lockout (L) — Appendix B of the I&O manual (Document 1252K) and Appendix 1 of the service manual (Document 1291) |
The parts list in Document 1252K separates the line into assemblies that scale with size — the NTH210 column starts sharing its blower, heat exchanger and gas-valve parts with the top NTH285 rather than the smaller models — but the operator interface and diagnostics remain identical across the series.
Both models report numeric Holds and Lockouts from the shared tables, support the lead-lag menus for multiple-boiler plants, and keep the factory 195°F dual-thermistor high-limit arrangement described in the manual's sensor chapter. The service manual, Document 1291, applies to both.
The step from 150 to 210 exists for loads in between: a building whose heat-loss calculation crosses the 150 column on a design day, or that pairs the boiler with NTV water-heating duty at the 210 scale, is where the NTH210 earns its place.
Laars Heating Systems
The Laars NTH150 is the mid-size NeoTherm Residential boiler: a floor-standing modulating condensing unit at the 150 step of the 080-285 MBTU/h range, on the numeric Hold/Lockout code system of Document 1252K.
Laars Heating Systems
The Laars NTH210 is the second-largest NeoTherm Residential boiler: a floor-standing modulating condensing unit at the 210 step of the 080-285 MBTU/h range, on the numeric Hold/Lockout code system of Document 1252K.
Some assemblies scale with the size — the parts list shows the NTH210 and NTH285 sharing blower, heat-exchanger and gas-train components that differ from the smaller columns — while jacket and control parts are common.
Yes. The manual documents lead-lag configuration (LL Master and LL Follower options with equal-run-time sequencing), so NTH models including the 150 and 210 can be staged together.
Appendix B of the I&O manual (Document 1252K, page 72) and Appendix 1 of the service manual (Document 1291), both of which cover the full 080-285 range.
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 7, 2026. Last updated September 7, 2026. Technical reviewer: not yet assigned.