TK-510U Submittal

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TBGSS01212

Residential / Commercial Gas

Tankless Water Heaters

SUGGESTED SPECIFICATIONS FOR THE TK-510U-I or TK-510U-E

The fully modulating, on-demand, gas ﬁred tankless water heater shall be Takagi Tankless Water Heater model TK-510U-I 200 or

TK-510U-E 200, having a maximum input rating of 199,000 Btu/h and available in natural gas (NG). For use with propane (LP) gas, the

heater shall be ﬁeld converted using the factory supplied conversion kit. The conversion kit shall be supplied with the heater. The heater

shall have ¾ in. male NPT water and gas connections. The inlet gas supply pressures shall be 4.0 in. WC (min.) up to 10.5 in. WC (max) for

NG and 8.0 in. WC (min) up to 14 in. WC (max) for LP. The heater shall be supplied with an integrated controller or a temperature remote,

9009069005, that can be installed up to 400 ft. from the heater using 20 gauge (minimum) control wire. The integrated controller or

temperature remote shall provide diagnostic information, fault history, and heater set temperature. The heater shall operate using 120 V /

60 Hz power source. The indoor heater will incorporate a factory installed power cord.

The indoor heater shall be vented with 4” diameter Category III vent pipe with a length not to exceed 60 ft. (equivalent), terminating

horizontally or vertically. The indoor heater can be direct vented using 3” diameter intake air pipe. The intake pipe may use material

such as PVC (solid core), ABS, aluminum, or Category III pipe and cannot exceed 60 ft. (equivalent) length. The outdoor heater shall be

constructed with an integral exhaust vent on the front of the heater.

The water heater shall use a commercial grade copper alloy, ﬁn tube heat exchanger with quick release brass or bronze waterways. The

heater shall be controlled by an onboard solid-state printed circuit board which uses the following factory installed components: thermistors

to monitor inlet and outlet water temperature; a ﬂow sensor to measure ﬂow rate; a ﬂame sensor to monitor combustion; an Air-Fuel Ratio

Rod to measure and adjust operation in order to maintain optimal combustion efﬁciency. The heater also consists of inline fusing and

surge absorbers for electrical surge protection, an electronic spark igniter, aluminized stainless steel burners, a hi-limit temperature switch,

modulating gas valve, an overheat cutoff fuse, ceramic heating blocks to protect the heat exchanger and water piping. The indoor heater

shall incorporate auto-ﬁre system for additional freeze protection.

The heater can manifold to Easy-Link up to 4 heaters to provide additional capacity. The Easy-Link controls shall be built onto the onboard

solid-state printed circuit board and does not require external controls. The linking control wire shall be supplied with the heater. A Multi-

Unit controller, 9008300005, can manifold 5-20 heaters. The Easy-Link and Multi-Unit Controller shall modulate the system for the most

efﬁcient performance. The Easy-Link and Multi-Unit Controller shall rotate the priority heater every 12 hours of operation time or 100 starts

for balanced duty/cycle operation.

The heater shall be design certiﬁed by CSA according to ANSI Z21.10.3, approved for sale in the United States, has a minimum energy

factor of 0.82, meets the energy efﬁciency requirements of the U. S. Department of Energy and ASHRAE 90.1, complies with SCAQMD Rule

1146.2 and other air quality districts with similar requirements for low NOx emissions of 14 ng/J or 20 ppm, and shall be Certiﬁed by NSF

to NSF/ANSI Standard 5.