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Cold/Hot Water Pipe Connection
1.
Connection size
Rp 3/4"
Note: The water heater has a hot water pipe for the outlet connector and a joint bushing
on the inlet connector. These devices are installed when the water heater leaves the factory
and must not be removed or damaged during installation. When the threaded joint is
screwed in, these devices will naturally be installed to the correct depth.
2.
Pipeline Size
To ensure the best performance, the pipe size should be selected according to the specific
installation needs. The following are the recommended pipe sizes.
Hot water pipe: Main pipe - 20mm（3/4"）; Branch pipe ≥ 15mm（1/2"）.
Cold water pipe: The size of the cold-water pipe should be the same or larger than the size of
the hot water pipe used.
3.
Cold Water Connection
The cold-water inlet is at lower part of the water heater and should be directly connected with
tap water. As shown in the figure, first connect a shut-off valve, then connect a non-return
valve on the side close to the heater, and finally connect a union.
If supply water pressure exceeds the rated max. pressure (680 kPa), a pressure limiting valve
shall be connected behind the non-return valve. If supply water quality does not meet the
specific water quality requirements, an expansion control valve shall be used.
4.
Hot water connection
The hot water supplied by the water heater has a relatively high temperature and cannot be
used directly for washing. It must be mixed with cold water. Therefore, the cold and hot water
mixing valve should be installed at the hot water use point, as shown in the figure.
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