Bock Water heaters 51PP User Manual

The drain valve fitting may be used as

an alternate cold water inlet on heaters

equipped with a dip tube, as shown in

Figure 3. By plumbing a “T” into the drain

fitting, the cold water inlet can be

relocated to this point. The dip tube

must be removed and its fitting plugged.

Figure 3 also shows a copper loop heat

trap installed on the hot water outlet to

reduce standby losses.

Note: When converting to this configu-

ration on an existing heater, visually

inspect the heater and make certain it

does not have scale buildup on the

bottom of the tank. Scale can restrict the flow

of water into the tank.
CAUTION!! Scalding injury and/or water

damage can occur from either the manual

lifting of the lever or the normal operation of the

T&P valve if it is not piped to a proper drain. If

the valve fails to flow water or reseat, call

a plumber.

– 3 –

FIGURE 3

FIGURE 2

CONNECT WATER

PIPING

Hot water outlet

(“HOT”) is on tank

top. Cold water inlet

is on right front

bottom of 33E and

40E. On all other

models, cold water

inlet is on tank top.

The 33E and 40E models are equipped with a

brass inlet bushing installed in the tank. Heat-

ers equipped with this bushing are marked next

to the inlet by the decal shown on the left. The

purpose of this bushing is to help keep the tank

bottom free of sediment by aiding tank flushing.

This bushing must be located as shown on the

decal to function properly. Do not allow the bush-

ing to rotate out of position when tightening the

inlet fittings. In installations requiring high flow

rates, contact the factory.

NOTE: INDEX MARK ON INLET BUSING MUST

POINT TOWARD ARROW ON DECAL. HOLD

INLET BUSHING OR NIPPLE WHEN TIGHTENING

FITTINGS. ROTATING BUSHING COULD DRASTI-

CALLY REDUCE PERFORMANCE.

INLET BUSHING

INDEX MARK

Connect the water piping, being careful not to apply heat to the heater

nipples. Install dielectric unions and shut off valves on both hot and cold water

lines.

The 40E and all “C” models (example: 32EC, 51PPC) have a 1” NPT tapping locat-

ed on the front left side of the tank. This is an alternate outlet for use with combined

appliance applications. If this fitting is not used, plug it with a fitting suitable for

potable water.

A 1” NPT fitting is also located behind the drain valve on the 40E and all

“C” models. This is for use as an alternate inlet or a combined appliance return.

Your heater is shipped with a reducer in this location to mount

the drain valve.

The drain valve fitting may be used as an alternate cold water inlet on heaters

equipped with a dip tube, as shown in Figure 3. By plumbing a “T” into the drain

fitting, the cold water inlet can be relocated to this point. The dip tube must be

removed and its fitting plugged. Figure 3 also shows a copper loop heat trap

installed on the hot water outlet to reduce standby losses.