REU-VR2626WB (B26) /REU-VR2426WS (S26) /REU-VRM2626WG (INF26) - 11 - Issue 3 - 13/11/14 ©Rinnai
6. Smartstart
At least one temperature controller model MC-91Q or a MC-503RC must be used in conjunction with the
water heater and the Smartstart® system. Alternatively, if water controllers cannot be used a manual
activation switch must be used. Water Controllers cannot be used with the 2426WS model.
The installation of the water heater and temperature controllers must be performed in accordance with the
installation instructions supplied with the water heater.
The Smartstart® system is designed for domestic installations. However, it may be suitable for certain non
domestic installations. See separate service manual for more information.
Principle of Operation (Fig.2)
The "Smartstart®" system heats the water in the pipework water connected between the water heater and
the hot water outlets before any outlets are opened using the 'flow and return' pipework principle. This
results in water savings and reduced waiting time for heated water delivery from the outlet when opened.
Traditional 'flow and return' systems usually keep the water in the pipework heated continuously. The
Smartstart® system however, only heats the water before the outlet is opened. This results in significant
energy savings because water is not heated unnecessarily whilst retaining the benefits of traditional flow
and return systems.
A schematic of the Smartstart® system installed in conjunction with a Rinnai continuous flow water heater
and temperature controller is shown in Fig.2 below.
If problems are experienced with Smartstart® operation refer to the Smartstart® Service Manual.
Figure 2 - Non Solar Hot Water Systems
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