Product Guide

At Takagi, we place the safety and
reliability of our products above all else.
By incorporating technologically advanced
safety features into every model, we
provide the assurance and peace of mind
that can only come from an Takagi quality
product.
Air-Fuel Ratio (AFR)
Sensor
Takagi’s unique AFR sensor monitors and
maintains proper combustion at all times.
Together with the onboard computer, this
system will adjust the fan motor speed to
ensure that air and fuel have a proper
mixture ratio, minimizing emissions and
maximizing efficiency.
Additional Safety
Features
Freeze Protection:
Every heater in Takagi’s tankless lineup has
an internal freeze protection system, which
is rated to protect the heaters when installed
in sub-freezing conditions. This system
works to keep water temperatures within the
heat exchanger from falling below a certain
level, preventing freeze damage.
SAFETY
HEAT EXCHANGER
IGNITER
AFR
FLAME SENSOR
BURNER
Hi-Limit Switch:
Ensures that water temperatures do not exceed safe levels. Before the water temperature can even reach these unsafe levels,
the hi-limit switch activates by disengaging the gas valves, effectively shutting down the water heater.
PVC Venting:
Indoor condensing models have a thermistor and hi-limit switch that monitor the exhaust temperature. If the exhaust
temperature nears an unsafe limit, these features regulate combustion and can shut the heater down to protect the integrity of
the PVC vent material.
Overheat Cutoff Fuse:
Ensures that there are no breaches in the heat exchanger drum. In cases where enough physical damage might have been
done to the water heater to lead to a breach in the heat exchanger drum, the overheat cutoff fuse reacts by shutting down the
water heater if the surface of the heat exchanger retains too much heat.
3