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Installation Manual
Bosch Tronic TR4000C Electric Tankless Water Heaters - BTC 722203301 A (08.2022)
11.2 Draining the Heater
1. If the heater has been installed with a drain valve, turn the water heater inlet
off . Open a faucet. Then open the drain valve to drain the heater.
11.3 Checking the Inlet Filter
1. Drain the water heater following Section 11.2.
2. Remove the check valve attached to the cold water inlet.
3. Use pliers to pull the fi lter down and out of the cold water inlet pipe.
Check
Valve
Inlet Filter
Cold Water
Inlet
4. Flush fi lter with water until clear.
5. Reinsert fi lter in cold water inlet and attach check valve.
6. Reconnect plumbing, turn on power, and check for proper operation.
11.4 Removing a Heating Element
1. Drain water heater following Section 11.2 and remove the front cover.
2. Take a phote of element wiring for reinstallation. Disconnect the wires from
the element. See Figure 13.
Figure 17
Element Wiring
Connections
Ground Wire
Connection
* Wiring not shown for clarity purposes
3. Use a pipe wrench to remove the element containing cap from the water
heating assembly.
Figure 18
Element
Containing
Cap
Heating
Element
O-Ring
4. Carefully remove the heating element.
5. When reassembling, reverse the steps.
NOTICE: PRODUCT DAMAGE, PROPERTY DAMAGE
Upon reinstallation, ensure O-ring is in good condition and
properly installed before securing element containing cap.
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