Canada-wide gas boiler information · On-site service in Greater Vancouver, BC
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Comparison
Verdict in brief
The NTH210 and NTH285 are the two largest NeoTherm Residential boilers — the 210 and 285 columns of Document 1252K — identical in control and code system, with the NTH285 topping the residential range at the point where larger loads move to Laars' commercial NeoTherm and XTR lines.
Published manufacturer figures. Input and output are kept separate; blanks mean the manufacturer did not publish that value.
| Specification | Laars NTH210 | Laars NTH285 |
|---|---|---|
| Maximum input (as printed) | 210 MBH | 285 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) |
At the top of the residential range the NTH210 and NTH285 share the parts architecture of the large columns — blower, heat exchanger and gas train components that the parts list distinguishes from the smaller sizes — plus the same operator interface, diagnostics menus and Hold/Lockout code tables in Documents 1252K and 1291.
Both support the lead-lag staging menus and the anti-short-cycle hold behaviour described in the manual, and both are boiler models whose water-heating counterparts are the NTV units documented alongside them. The 285 column is the ceiling of the residential 080-285 specification.
The NTH285 earns its place when the heat-loss calculation approaches the top of the residential range; beyond it, Laars' commercial documentation — NeoTherm NTH 399-850 / NTV 285-850 (Document 1330M) and NeoTherm XTR NT2H/NT2V 399-1500 (Document 1475C) — covers larger loads with different controls and code tables.
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.
Laars Heating Systems
The Laars NTH285 is the largest NeoTherm Residential boiler: a floor-standing modulating condensing unit at the 285 top of the 080-285 MBTU/h range, on the numeric Hold/Lockout code system of Document 1252K.
The NTH285 at the 285 column — the top of the Model NTH 080-285 MBTU/h range in Document 1252K. Larger sizes belong to the commercial NeoTherm and XTR lines.
Yes — both use the residential tables in Document 1252K (Appendix B) and Document 1291 (Appendix 1). Those tables do not apply to the commercial NeoTherm touchscreen units, which have their own code sets.
When the calculated load of the building approaches or exceeds the 210 column on a design day. Below that load the NTH210 behaves identically at a smaller size step.
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.