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Comparison
Verdict in brief
The Laars NeoTherm XTR NT2H 500 and Laars NeoTherm XTR NT2H 650 are both condensing boilers in the Laars Heating Systems NeoTherm XTR line. Published ratings: Laars NeoTherm XTR NT2H 500 at 50–500 MBH input, 483 MBH output and 96.6% thermal efficiency; Laars NeoTherm XTR NT2H 650 at 65–650 MBH input, 627 MBH output and 96.5% thermal efficiency. Laars NeoTherm XTR NT2H 650 lists 150 MBH more input than Laars NeoTherm XTR NT2H 500 (650 MBH against 500 MBH). Laars NeoTherm XTR NT2H 500 carries the higher published thermal efficiency at 96.6%, against 96.5%. Laars NeoTherm XTR NT2H 650 lists 79 lb more shipping weight than Laars NeoTherm XTR NT2H 500 (597 lb against 518 lb).
Published manufacturer figures. Input and output are kept separate; blanks mean the manufacturer did not publish that value.
| Specification | Laars NeoTherm XTR NT2H 500 | Laars NeoTherm XTR NT2H 650 |
|---|---|---|
| Input, minimum | 50 MBH | 65 MBH |
| Input, maximum | 500 MBH | 650 MBH |
| Output, minimum | 48.3 MBH | 62.7 MBH |
| Output, maximum | 483 MBH | 627 MBH |
| Efficiency (thermal) | 96.6 % | 96.5 % |
| Turndown | 10:1 | 10:1 |
| Water content | 4.8 gal | 6.4 gal |
| Shipping weight | 518 lb | 597 lb |
| Efficiency (combustion) | 98.9 % | 98.7 % |
Published ratings: the Laars NeoTherm XTR NT2H 500 is rated 50–500 MBH input, 483 MBH output and 96.6% thermal efficiency; the Laars NeoTherm XTR NT2H 650 is rated 65–650 MBH input, 627 MBH output and 96.5% thermal efficiency. Laars NeoTherm XTR NT2H 650 lists 150 MBH more input than Laars NeoTherm XTR NT2H 500 (650 MBH against 500 MBH). Laars NeoTherm XTR NT2H 500 carries the higher published thermal efficiency at 96.6%, against 96.5%.
Laars NeoTherm XTR NT2H 650 lists 79 lb more shipping weight than Laars NeoTherm XTR NT2H 500 (597 lb against 518 lb). The boiler water content differs: the Laars NeoTherm XTR NT2H 500 lists 4.8 gal, while the Laars NeoTherm XTR NT2H 650 lists 6.4 gal.
Both models are documented by the official Laars Heating Systems sources cited on their model records; the shared values above are taken from those documents.
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.
Laars Heating Systems
The Laars NeoTherm XTR NT2H 650 is a commercial condensing boiler rated 65-650 MBH input and 62.7-627 MBH output at 96.5% AHRI thermal efficiency, with 6.4 gallons of water content and a 597 lb shipping weight.
The Laars NeoTherm XTR NT2H 650 lists 650 MBH, against 500 MBH on the Laars NeoTherm XTR NT2H 500, per the cited documentation.
The Laars NeoTherm XTR NT2H 500 carries the higher published thermal efficiency at 96.6%, against 96.5%.
It ships at 597 lb against 518 lb for the Laars NeoTherm XTR NT2H 500, per the cited sources.
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.