The T-H3-DV-NG from Takagi is an Indoor Tankless Water Heater, Natural Gas, 199K BTU. 

Features:

• Continuous Maximum Flow Rates Up to 10.0 GPM;
• Ultra-Low NOx Condensing Technology;

Durable Heat Exchanger:

• Primary Heat Exchanger is constructed of HRS35 Commercial-Grade Copper
• Secondary Heat Exchanger is made of Type 316L Stainless Steel
• Energy Star Qualified;
• Can be used in both Residential and Commercial applications;
• Electronic Ignition - No Pilot Light;
• Internal Freeze-Protection System;
• Includes a Built in Temperature Controller and Advanced Diagnostic to Simplify Troubleshooting;
• Factory-Installed Power Cord;

Easy-Link Up to 4 Units:

• With no additional parts or accessories needed
• Multi-Link Up to 20 Units;
• Complies With Lead Free Standards;

Safety:

• Air-Fuel Ratio (AFR) Sensor
• Exhaust & Water Temperature Safety Control
• Overheat Cut-Off Fuse
• Internal Freeze Protection System;

Power Direct Vent Design:

• Exhaust, 3" PVC Venting up to 70 Feet or 4" PVC Venting up to 100 Feet
• Provides flexible venting with PVC, CPVC, or ABS Pipe for Intake and Exhaust (solid core only). Canadian Installations Require ULCS636 Listed PVC or CPVC Pipe for Venting.
• Category IV Stainless Steel venting can also be used.

Technical Specifications:

• Gas Connection 3/4" NPT;
• Water Connection 3/4" NPT;
• NG Gas Pressure Inlet Min. 5.0"WC Max. 10.5"WC;
• Weight 59lbs;
• Dimensions 22.4" x 17.7" x 10.7";
• Ignition Electronic Ignition;
• Electrical Supply AC 120V (60 Hz);
• Water Pressure Min. 15psi Max. 150psi;
• T-H3DV Manifold Pressure Natural: 2.95"WC Propane: 3.3"WC;
• LPG Input Min. 15,000BTU/h Max. 199,000BTU/h.