Takagi T-K3 User Manual

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APPLICATIONS
Space Heating Applications
WARNING
• Toxic chemicals used in boiler treatments such as alcohol, glycerol and glycol group
must not be introduced into the system when used for open loop potable water and
space heating.
• The T-K3/T-K3-Pro can be used to supply potable water and space heating and shall
not be connected to any heating system or component(s) previously used with non-
potable water where any chemicals were added to the water heating appliances.
• When the system requires water for space heating at temperatures higher than required
for other uses, a means such as a mixing valve shall be installed to temper the water for
those other uses in order to reduce scald hazard potential.
• Water temperature over 125 °F can cause severe burns instantly or death from scalds.
• Chemicals such as diluted Glycol can be used for radiant floor, Hydro/fan coil air or
Baseboard heating only. The diluted solution of glycol must contain LESS than 30% of
Glycol. Be aware that in closed-loop glycol systems, low pressure in the heat exchanger
can cause low-temperature boiling, resulting in excessive noise and damage to the
water heater. Consult with the glycol maker for specifications prior to use.
Re-circulation:
This is a concept drawing only.
* Size the pump to provide at about
2
GPM through the
system at 15 Ft of Head plus applications and piping head
losses. 2 GPM will allow the system to operate at its
optimal performance.
* If the application requires a higher re-circulating flow rate,
make sure that the re-circulating flow rate is no greater
than 4 GPM. If the flow rate is too high, the system could
be damaged by erosion

Takagi T-K3 Specifications

General

Type	Tankless
Installation Type	Indoor
Maximum BTU Input	199, 000 BTU/h
Gas Connection Size	3/4"
Vent Size	3"
Hot Water Flow Rate (at 35°C rise)	6.6 GPM
Maximum Input	199, 000 BTU/h