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Comparison
Verdict in brief
Takagi TK-540P-NIH and Takagi TK-540P-PEH are two tankless water heaters from the Takagi TK-540P Series line. The Takagi TK-540P-NIH is rated 15,000–199,000 BTU/h input and 0.93 UEF, and the Takagi TK-540P-PEH is rated 13,000–199,000 BTU/h input and 0.95 UEF. Both list the same published input of 199,000 BTU/h. Takagi TK-540P-PEH carries the higher published efficiency at 0.95 UEF, against 0.93 UEF. Takagi TK-540P-NIH lists 2 lb more shipping weight than Takagi TK-540P-PEH (71 lb against 69 lb).
Published manufacturer figures. Input and output are kept separate; blanks mean the manufacturer did not publish that value.
| Specification | Takagi TK-540P-NIH | Takagi TK-540P-PEH |
|---|---|---|
| Input, minimum | 15,000 BTU/h | 13,000 BTU/h |
| Input, maximum | 199,000 BTU/h | 199,000 BTU/h |
| Weight | 71 lb | 69 lb |
| Dimensions (H × W × D) | 23-5/8 × 17-3/4 × 11-1/4 in | 23-5/8 × 17-3/4 × 11-1/4 in |
| Venting | Power direct vent: 3" PVC to 70 ft or 4" PVC to 100 ft; PVC/CPVC/ABS solid core | Outdoor model; power direct vent design per the specification sheet |
| Hot/cold water connections | 3/4" NPT | 3/4" NPT |
| Gas connection | 3/4" NPT | 3/4" NPT |
| Uniform Energy Factor (UEF) | 0.93 UEF | 0.95 UEF |
| Maximum flow rate | 10 GPM | 10 GPM |
| Installation | Indoor | Outdoor |
| Technology | Condensing tankless water heater | Condensing tankless water heater |
| Recirculation | Integrated recirculation pump | Integrated recirculation pump |
| Manifold capability | Easy-Link with up to three other T-H3 units; common vent up to 8 units | Easy-Link with up to three other T-H3 units; common vent up to 8 units |
Published ratings: the Takagi TK-540P-NIH is rated 15,000–199,000 BTU/h input and 0.93 UEF; the Takagi TK-540P-PEH is rated 13,000–199,000 BTU/h input and 0.95 UEF. Both list the same published input of 199,000 BTU/h. Takagi TK-540P-PEH carries the higher published efficiency at 0.95 UEF, against 0.93 UEF.
Takagi TK-540P-NIH lists 2 lb more shipping weight than Takagi TK-540P-PEH (71 lb against 69 lb). The venting differs: the Takagi TK-540P-NIH lists Power direct vent: 3" PVC to 70 ft or 4" PVC to 100 ft; PVC/CPVC/ABS solid core, while the Takagi TK-540P-PEH lists Outdoor model; power direct vent design per the specification sheet. The installation differs: the Takagi TK-540P-NIH lists Indoor, while the Takagi TK-540P-PEH lists Outdoor.
Both records print the same input (199,000 BTU/h), dimensions (23-5/8 × 17-3/4 × 11-1/4 in), water connections (3/4" NPT) and gas connection (3/4" NPT), per the cited sources.
Takagi
The Takagi TK-540P-NIH is a condensing tankless water heater — a DHW-only appliance, not a boiler — firing 15,000 to 199,000 BTU/h on natural gas with 0.93 UEF and up to 10 GPM.
Takagi
The Takagi TK-540P-PEH is a condensing tankless water heater — a DHW-only appliance, not a boiler — firing 13,000 to 199,000 BTU/h on propane with 0.95 UEF and up to 10 GPM.
Yes — both list 199,000 BTU/h in the cited documentation.
The Takagi TK-540P-PEH carries the higher published efficiency at 0.95 UEF, against 0.93 UEF.
It ships at 71 lb against 69 lb for the Takagi TK-540P-PEH, 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.