Canada-wide gas boiler information · On-site service in Greater Vancouver, BC
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Comparison
Verdict in brief
The NTH080 and NTH105 are the two smallest NeoTherm Residential boilers — the 80 and 105 columns of the NTH parts list in Document 1252K — and are the same floor-standing modulating condensing platform with identical Hold/Lockout diagnostics; only the size step differs.
Published manufacturer figures. Input and output are kept separate; blanks mean the manufacturer did not publish that value.
| Specification | Laars NTH080 | Laars NTH105 |
|---|---|---|
| Maximum input (as printed) | 80 MBH | 105 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) |
Both models are part of the Model NTH 080-285 line documented in I&O Document 1252K, and the parts list's size columns place them next to each other at 80 and 105. They share the floor-standing condensing design, the menu-driven operator interface, the factory 195°F high-limit sensing and the same Appendix B code tables.
Codes on both are numeric Holds or Lockouts — internal faults, the safety chain (63), high-limit, delta-T, stack and sensor entries — read from Appendix B of Document 1252K or Appendix 1 of the service manual, Document 1291. Neither model produces its own domestic hot water; the NTV water heaters documented alongside the NTH in Document 1291 handle water-heating roles.
The choice is therefore capacity: a heat-loss calculation that fits the 080 column is served by the NTH080, and a load that approaches or crosses it points to the NTH105, which is the first step up in the 80-105-150-210-285 ladder.
Laars Heating Systems
The Laars NTH080 is the smallest NeoTherm Residential boiler: a floor-standing modulating condensing unit at the 080 size step, with the numeric Hold/Lockout code system of I&O Document 1252K.
Laars Heating Systems
The Laars NTH105 is the second NeoTherm Residential boiler size: a floor-standing modulating condensing unit at the 105 step between NTH080 and NTH150, on the numeric Hold/Lockout code system of Document 1252K.
The parts list in Document 1252K runs 80, 105, 150, 210 and 285 (the NTH080 through NTH285 models), so the NTH105 sits directly above the NTH080.
No. Both use the same residential NeoTherm tables: Appendix B of Document 1252K and Appendix 1 of Document 1291, with each code typed Hold or Lockout.
The NTH line is documented for residential and light commercial use, and the choice between the 080 and 105 steps follows the heat-loss calculation of the space, not the building type alone.
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.