Flow Rate; Operation Guide - Craftsman CMXTEPA0018 Instruction Manual

9. Flow Rate

The chart below indicates maximum temperature rise for a given flow rate
Item # kW
CMXTEPA0018 (18kW) 18
CMXTEPA0024 (24kW) 24
CMXTEPA0029 (29kW) 28.8
CMXTEPA0036 (36kW) 36

10. Operation Guide

Operating your new tankless water heater is similar to using any traditional water heating system. However, it is essential that you carefully
read all setup procedures, operating instructions and tips to ensure the maximum performance and energy savings from your new water
heater. We recommend that all members of the household read these General Operating Instructions.
This electric water heater is designed to supply hot water. The unit contains heating elements within, capable of heating water quickly on-
demand for as long as you need it. Unlike a conventional tank storage water heater, this unit is a tankless water heater that does not store
hot water. However, once you begin using the system, you will understand it works like a conventional tank system.
Tankless system delivers hot water instantaneously on demand. Since a tankless system does not waste energy continually when heating
water, i.e. idly sitting and losing heat in a storage tank, it provides significant energy savings than a conventional water heater.
With your new system, as soon as you turn on the hot water faucet, the demand for hot water is detected by a flow sensor, and the high-
power heating elements are activated. Sensors continually monitor the water flow rate and measured the incoming and outgoing water
temperature. Data is transmitted to the system logic controls, which determines the exact amount of power required by heating elements
to heat the water to your desired temperature.
It is essential to keep in mind that all tankless water heaters are subject to a maximum flow rate. If this flow rate is exceeded, the heater will
not be capable of sufficiently heating water.
Also keep in mind that conventional tank heaters are set to high temperatures to prevent running out of hot water quickly, and thus a large
amount of cold water needs to be mixed in to reach a comfortable level for washing and showering. Since this unit heats water on demand,
it is designed to heat to a lower temperature. This means you only need to mix in a small amount of cold water or none at all.
Your hot water supply may also be affected by the incoming water temperatures as the season differs. During winter, if the incoming water
temperature is frigid, you might not be able to run multiple hot water outlets at the same time as compared to the summer. However, you
can run showers back-to-back without having to wait for the water to heat.
Water Quality: One of the things which should be taken into consideration when installing and maintaining the water heater is the
quality of water. Water conditions outside the recommended levels outlined below are not permitted and can damage the water heater. We
reserve the right to deny any warranty claim regarding damage suffered due to use in water conditions that are not in accordance with the
table below. The water must be treated, and the heater flushed regularly when this product is installed in an area that is known to have hard
water that causes scale build-up to prevent damage to the heat exchanger and heating elements. We recommend that a water treatment
device or water softener should be installed to maintain optimal performance of the water heater in hard water areas.
TEMPERATURE RISE CHART (GPM)
30°F 40°F
1.75 GPM 2.04 GPM
5.2 GPM 3.95 GPM
5.9 GPM 4.5 GPM
6.2 GPM 5.15 GPM
Based on 105°F Output Water Temp / GPM = Gallons Per Minute
50°F 60°F
2.46 GPM 3.06 GPM
3.52 GPM 3.3 GPM
3.87 GPM 3.47 GPM
4.4 GPM 3.9 GPM
70°F
4.1 GPM
2.4 GPM
2.8 GPM
3.1 GPM
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