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Comparison
Verdict in brief
Both the Laars NeoTherm NTH 750 and the Laars NeoTherm NTH 850 belong to the Laars Heating Systems NeoTherm Commercial line of condensing boilers. The Laars NeoTherm NTH 750 is rated 750,000 BTU/hr input, 724,000 BTU/hr output and 96.6% thermal efficiency, and the Laars NeoTherm NTH 850 is rated 850,000 BTU/hr input, 813,000 BTU/hr output and 95.7% thermal efficiency. Laars NeoTherm NTH 850 lists 100,000 BTU/hr more input than Laars NeoTherm NTH 750 (850,000 BTU/hr against 750,000 BTU/hr). Laars NeoTherm NTH 750 carries the higher published thermal efficiency at 96.6%, against 95.7%. Laars NeoTherm NTH 850 lists 22 lb more shipping weight than Laars NeoTherm NTH 750 (503 lb against 481 lb).
Published manufacturer figures. Input and output are kept separate; blanks mean the manufacturer did not publish that value.
| Specification | Laars NeoTherm NTH 750 | Laars NeoTherm NTH 850 |
|---|---|---|
| Input | 750,000 BTU/hr | 850,000 BTU/hr |
| Output | 724,000 BTU/hr | 813,000 BTU/hr |
| Efficiency (thermal) | 96.6 % | 95.7 % |
| Turndown | 5:1 | 5:1 |
| Shipping weight | 481 lb | 503 lb |
| Water connection | 2" NPT | 2" NPT |
| Gas connection | 1-1/2" NPT | 1-1/2" NPT |
| Efficiency (combustion) | 96.6 % | 95.7 % |
Published ratings: the Laars NeoTherm NTH 750 is rated 750,000 BTU/hr input, 724,000 BTU/hr output and 96.6% thermal efficiency; the Laars NeoTherm NTH 850 is rated 850,000 BTU/hr input, 813,000 BTU/hr output and 95.7% thermal efficiency. Laars NeoTherm NTH 850 lists 100,000 BTU/hr more input than Laars NeoTherm NTH 750 (850,000 BTU/hr against 750,000 BTU/hr). Laars NeoTherm NTH 750 carries the higher published thermal efficiency at 96.6%, against 95.7%.
Laars NeoTherm NTH 850 lists 22 lb more shipping weight than Laars NeoTherm NTH 750 (503 lb against 481 lb).
Both records print the same turndown (5:1), water connections (2" NPT) and gas connection (1-1/2" NPT), per the cited sources.
Laars Heating Systems
The Laars NeoTherm NTH 750 is a commercial condensing boiler rated 750,000 BTU/hr input and 724,000 BTU/hr output at 96.6% thermal efficiency, with a 1-1/2" NPT gas connection, 2" NPT water connection and a 481 lb shipping weight.
Laars Heating Systems
The Laars NeoTherm NTH 850 is a commercial condensing boiler rated 850,000 BTU/hr input and 813,000 BTU/hr output at 95.7% thermal efficiency, with a 1-1/2" NPT gas connection, 2" NPT water connection and a 503 lb shipping weight.
The Laars NeoTherm NTH 850 lists 850,000 BTU/hr, against 750,000 BTU/hr on the Laars NeoTherm NTH 750, per the cited documentation.
The Laars NeoTherm NTH 750 carries the higher published thermal efficiency at 96.6%, against 95.7%.
It ships at 503 lb against 481 lb for the Laars NeoTherm NTH 750, 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.