Baxi Maxflow Combi WM Installation And Servicing Instructions page 10

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6.0 System Details
6.3 Bypass
1. The boiler has an integral bypass and in most
cases this should suffice. However in certain
circumstances, e.g. on systems where there is a
high resistance and TRV's are fitted to all the
radiators it may be necessary to fit an external
by-pass. For example, a 15mm pipe between the
flow and return controlled by a valve, or an
uncontrolled radiator.
6.4 System Control
1. The boiler is designed for use in a heating
system that incorporates external controls, i.e. a
minimum of a timer device.
2. Suitable timer kits are available as optional
extras.
3. For optimum operating conditions and
maximum economy the fitting of a programmable
thermostat, such as the Baxi Maxflow Combi WM
Controller, is recommended.