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Comparison
Verdict in brief
Laars NeoTherm XTR NT2H 650 and Laars NeoTherm XTR NT2H 800 are two condensing boilers from the Laars Heating Systems NeoTherm XTR line. Published ratings: Laars NeoTherm XTR NT2H 650 at 65–650 MBH input, 627 MBH output and 96.5% thermal efficiency; Laars NeoTherm XTR NT2H 800 at 80–800 MBH input, 771 MBH output and 96.4% thermal efficiency. Laars NeoTherm XTR NT2H 800 lists 150 MBH more input than Laars NeoTherm XTR NT2H 650 (800 MBH against 650 MBH). Laars NeoTherm XTR NT2H 650 carries the higher published thermal efficiency at 96.5%, against 96.4%. Laars NeoTherm XTR NT2H 800 lists 21 lb more shipping weight than Laars NeoTherm XTR NT2H 650 (618 lb against 597 lb).
Published manufacturer figures. Input and output are kept separate; blanks mean the manufacturer did not publish that value.
| Specification | Laars NeoTherm XTR NT2H 650 | Laars NeoTherm XTR NT2H 800 |
|---|---|---|
| Input, minimum | 65 MBH | 80 MBH |
| Input, maximum | 650 MBH | 800 MBH |
| Output, minimum | 62.7 MBH | 77.1 MBH |
| Output, maximum | 627 MBH | 771 MBH |
| Efficiency (thermal) | 96.5 % | 96.4 % |
| Turndown | 10:1 | 10:1 |
| Water content | 6.4 gal | 7.4 gal |
| Shipping weight | 597 lb | 618 lb |
| Efficiency (combustion) | 98.7 % | 98.5 % |
Published ratings: the Laars NeoTherm XTR NT2H 650 is rated 65–650 MBH input, 627 MBH output and 96.5% thermal efficiency; the Laars NeoTherm XTR NT2H 800 is rated 80–800 MBH input, 771 MBH output and 96.4% thermal efficiency. Laars NeoTherm XTR NT2H 800 lists 150 MBH more input than Laars NeoTherm XTR NT2H 650 (800 MBH against 650 MBH). Laars NeoTherm XTR NT2H 650 carries the higher published thermal efficiency at 96.5%, against 96.4%.
Laars NeoTherm XTR NT2H 800 lists 21 lb more shipping weight than Laars NeoTherm XTR NT2H 650 (618 lb against 597 lb). The boiler water content differs: the Laars NeoTherm XTR NT2H 650 lists 6.4 gal, while the Laars NeoTherm XTR NT2H 800 lists 7.4 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 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.
Laars Heating Systems
The Laars NeoTherm XTR NT2H 800 is a commercial condensing boiler rated 80-800 MBH input and 77.1-771 MBH output at 96.4% AHRI thermal efficiency, with 7.4 gallons of water content and a 618 lb shipping weight.
The Laars NeoTherm XTR NT2H 800 lists 800 MBH, against 650 MBH on the Laars NeoTherm XTR NT2H 650, per the cited documentation.
The Laars NeoTherm XTR NT2H 650 carries the higher published thermal efficiency at 96.5%, against 96.4%.
It ships at 618 lb against 597 lb for the Laars NeoTherm XTR NT2H 650, 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.