Toyotomi BS-35(F) - Manual (Page 24)

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CAUTION: In order to prevent the water heater from being broken or caused with a leak,
regardless of being used in a cold region or in a warm or hot region, the cold water
supply piping, hot water supply piping, drain pipe, pressure relief valve and
pressure reducing valve are to be protected with sufficient insulation materials (by
wrapping with heat insulation or by equipping an freeze prevention heater).
1. A water softener is recommended in regions where hard water may be a concern.
2. Do not apply any heat to the unit nipples.
3. Use standard copper alloy unions and nipples for the connections to the unit.
4. Copper piping is recommended for the hot water supply line.
Note: Refer to local codes when considering piping materials. Steel piping is not
recommended as it may cause rust in the piping. Use NPT for piping of hot and cold
water.
5. Connecting plumbing to the unit, hold unit fittings securely with a wrench to prevent
damage to the unit.
6. Installation of a water strainer and the air release valve is recommended.
7. Connection between the water heater and places where how water is used should be as
short and direct as possible, and a uniform pipe size of sufficient diameter to carry the full
capacity of hot water should be used.
8. Be sure to connect the water inlet and the hot water outlet as shown on the water heater.
Reversing the two connections will damage the unit.
9. When hot water flows through the supply line there is an inevitable heat loss, regardless of
type of water heater. Thus, insulation or protection of hot water piping is encouraged.
10. Flush the piping before connecting to the unit.
Plumbing Example
<Pressure Reducing Valve>