Notice, Using the water smart / bath fill function – Rinnai RV53I User Manual
Page 7

RV53i & RV53e Operation and Installation Manual
7
Setting the Water Volume
Using the Water Smart / Bath Fill Function
Overview
This function is exclusive to the BC-100V temperature 
controller. The bath fill function allows the consumer 
to fill a tub with a preset volume of water at a preset 
temperature. This is done by pressing the bath fill 
button on the BC-100V controller while no hot water is 
flowing and then opening only the hot water tap. The 
water heater will stop the hot water flow when the 
preset volume has been reached. The hot water tap 
should then be closed and the bath fill button pressed. 
The temperature settings for the bath fill function are 
limited to those in the table below.
Power
Loss
If power is lost during the bath fill 
function, the water heater will shut 
down but the water will continue to 
flow. When power returns, the water 
shuts off and Error Code 03 appears 
on the controller. 
If power is lost after the bath has filled 
but before the bath fill function button 
is de-selected, then the water will not 
flow during the power loss or after the 
power is returned. Once power 
returns, close the hot water tap and 
de-select the bath fill function. No 
error code appears. 
NOTICE
Multiple
Water
Heaters
The bath fill function will not work 
properly if it is connected to multiple 
water heaters. The tub will overfill 
because the bath fill function is not 
able to measure the water volume 
when connected to multiple water 
heaters. 
NOTICE
Bath Fill Temperature Settings
Available
ºF 98 100 102 104 106 108
ºC 37 38 39 40 41 42
ºF 110 112 114 116 118 120
ºC 43 44 46 47 48 49
Anti-scald
Fixtures
Do not use with single handle fixtures 
that have anti-scald features built into 
them. These fixtures allow a 
predetermined amount of cold water 
which is not taken into account by the 
bath fill function. 
NOTICE
1. Press the “Priority” button on the
temperature controller. The green 
Priority light will glow indicating 
that this controller is controlling 
the temperature and that the 
Rinnai water heater is ready to 
supply hot water. 
2. Press the “Water Smart Bath Fill”
button to set the water volume 
and temperature. 
3. Press the “Temp” ▲ or ▼ buttons
to obtain the desired temperature 
setting. 
To Prevent
Over Filling
Be careful not to overfill the bath. An 
average bath volume is 60 gallons. 
When filling the bath using this 
function for the first time: 
• Monitor and remain by the bath
while the water is running.
• Use a low bath fill volume less than
25 gallons.
NOTICE
The default volume is set to 25 gallons. The volume 
can be set between 10 and 120 gallons. 
4. Press the “Water Vol.”▲ or ▼
buttons to obtain the desired 
water volume in gallons. 
5. Press the “Water Smart Bath Fill”
button.
