Bosch C1210ES Specifications download pdf (Page 18)

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Installation instructions

Appliance condensate drain installation

The appliance comes equipped with an internal

condensate drain and siphon. This drains condensation

formed in the secondary heat exchanger. Piping must

be installed under the condensate drain outlet on the

water heater and piped for disposal in accordance with

local codes.

Fig. 18 Appliance drain installation

External condensate drain installation

If an external condensate drain (installer supplied) must

be installed (Section 3.3.2), the following is

recommended:

• 1. Install condensate drain on a horizontal section of

the exhaust pipe as close to the heater as possible.

• 2. The condensate must be disposed of according to

local codes.

• 3. To install condensate drain in vent system, use

PVC 3" X 3" X 1.5" tee and reduce for drain

connection.

Fig. 19 External condensate drain installation

3.3.6 Freeze prevention

In cold climates, components of a tankless water heater

can freeze and burst from negative draft. A leading

cause of negative draft is combustion appliances in the

building not being supplied with sufficient combustion

air. A wood stove or furnace can pull its combustion air

from the water heater‘s vent pipe, allowing the cold

incoming air to freeze the cold water in the heat

exchanger. Supplying more combustion air for all com-

bustion appliances is the solution. A HVAC specialist

should be consulted to design solutions for providing

more combustion air.

Listed below is an additional measure designed to fur-

ther limit backdraft in extreme conditions assuming all

other possible causes have been addressed.

The condensate must be disposed of in

accordance with local codes.

See chapter 3.11 “Filling the condensate

trap”.

Use materials approved by the authority

having jurisdiction. In the absence of other

authority, PVC, and CPVC pipe must

comply with ASTM D1785, F441 or

D2665. Cement and primer must comply

with ASTM D2564 or F493. For Canada,

use CSA or ULC certified PVC or CPVC

pipe, fittings and cement, see table 2.

Leave min. ¼" air gap

1 ½" x ¾" PVC Reducer

Trap required

6720608643-17.2V

Dispose of condensate in

accordance with local codes

4” Min.

Condensate drain

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Bosch C1210ES Specifications Page 18

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