Canada-wide gas boiler information · On-site service in Greater Vancouver, BC
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Comparison
Verdict in brief
The NeoTherm XTR NT2H 399 and NT2H 500 are the two smallest XTR boilers: 39.9-399 versus 50-500 MBH input and 386 versus 483 MBH maximum output, both at 96.7% and 96.6% AHRI thermal efficiency with 10:1 turndown. The 500 adds 97 MBH of output and 0.4 gallons of water content.
Published manufacturer figures. Input and output are kept separate; blanks mean the manufacturer did not publish that value.
| Specification | Laars NeoTherm XTR NT2H 399 | Laars NeoTherm XTR NT2H 500 |
|---|---|---|
| Input, minimum | 39.9 MBH | 50 MBH |
| Input, maximum | 399 MBH | 500 MBH |
| Output, minimum | 38.6 MBH | 48.3 MBH |
| Output, maximum | 386 MBH | 483 MBH |
| Efficiency (thermal) | 96.7 % | 96.6 % |
| Efficiency (combustion) | 99 % | 98.9 % |
| Water content | 4.4 gal | 4.8 gal |
| Shipping weight | 508 lb | 518 lb |
| Turndown | 10:1 | 10:1 |
The Document 1477 submittal lists the NT2H 399 at 39.9-399 MBH input, 38.6-386 MBH output and 96.7% thermal efficiency; the NT2H 500 lists 50-500 MBH input, 48.3-483 MBH output and 96.6% thermal efficiency.
Water content rises from 4.4 to 4.8 gallons and shipping weight from 508 to 518 lb, so both fit a similar rigging plan while the 500 delivers more capacity.
Both models share the Laars Linc control, Vari-Prime pump control, 10:1 turndown and the XTR's dual-venturi combustion system.
Laars Heating Systems
The Laars NeoTherm XTR NT2H 399 is a commercial condensing boiler rated 39.9-399 MBH input and 38.6-386 MBH output at 96.7% AHRI thermal efficiency, with 4.4 gallons of water content and a 508 lb shipping weight.
Laars Heating Systems
The Laars NeoTherm XTR NT2H 500 is a commercial condensing boiler rated 50-500 MBH input and 48.3-483 MBH output at 96.6% AHRI thermal efficiency, with 4.8 gallons of water content and a 518 lb shipping weight.
The Document 1477 submittal prints 96.7% thermal efficiency for the NT2H 399 and 96.6% for the NT2H 500.
Yes — both run the Laars Linc touchscreen control with cascade up to eight units and Vari-Prime pump control.
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.