Installation Guide

The pressure relief device is designed into the water heater. The device will work
automatically, when excessive build up of pressure occurs. Do not replace the
pressure relief device with any other screw.
The unit is built of fireproof material.
There is a safety thermal cut-out device in the water heater. This thermostat will cut
off electricity to prevent scalding, when there is a sudden rise in water temperature,
thus protecting the user.
All models can be fitted with Leakage Circuit Breaker. (optional)
It is important to keep the showerhead clean in order to maintain the performance
of the water heater.
12 13
We recommend that you install the unit under the sink in the main bathrooms or
utility areas. This will allow for lower amperage usage and a reduced heat loss from
long pipe runs.
For additional savings, reduce the water flow valve at the inlet of the heater so the
temperature increases.
Your Marey Power Pak Plus should give you trouble free operation, however
should a problem or fault occur, the table below will assist in identifying the most
common faults. Diagnosis and fault finding should be carried out by a qualified
individual, skilled in electrical/plumbing.
Power not connected
No heating occurs
Insufficient Amperage at Breaker Too much water flow Too little water flow Heating Dial Not High Enough Incorrect Wiring Overheat Sensor Engaging
Water is not warm
enough
Water starts out
hot but then unit
shuts off
Breaker is tripping
Double check for correct
wiring and that all
connections are secure.
Ensure that there is
sufficient water flow to
engage unit (9 PSI)
Increase size of breaker
to 40 Amps if smaller
breaker is in use. Turn
heating dial to full.
Reduce amount of water
flowing through the unit.
Oveheat sensor is
shutting the unit off.
Increase water flow or
decrease heat setting.
Double check for correct
wiring and that all
connections are secure.
Ensure that heating dial
is no higher than breaker
size.
1 2 3 4PP110
GPM*
0.75
1.0
1.25
1.5
2.0
2.5
3.0
4.0
11º
8º
6º
5º
3º
25º
18º
14º
12º
7º
36º
30º
23º
20º
11º
8º
38º
32º
30º
26º
16º
14º
12º
8º
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TEMP. INCREASE PER GPM
*GPM = Gallons per Minute
1 2 3 4
GPM*
1.0
1.5
2.0
2.5
3.0
25º
17º
12º
10º
46º
32º
21º
17º
66º
48º
31º
25º
20º
-
58º
41º
33º
26º
13º6º
TEMP. INCREASE PER GPM