DAFI Instant Water Heater
The DAFI Instantaneous Electric Water Heater is a compact, energy-saving and convenient solution to providing instant hot water to any point in a building. Compact shape and small size allows under sink mounting. Can be used with standard mixers & taps. Heats the water only when you turn the tap on. Consumes energy when it is being used – there are no standby energy losses. The Dafi water heater supplies hot water immediately. The temperature of the outlet water depends on the power of the unit (kW), the flow rate and the inlet cold water temperature. The DAFI water heater has small overall dimension and yet retains all the technical parameters of traditional, large heating devices. Its small size makes it possible to install the heater above or under washbasins sinks, or next to shower cabin or baths.
Specification:
Designed to be installed under the sink, next to the shower
Provides hot water in one or more points
Designed to be mounted at any angle
Power from 3.7 kW to 11 kW (depending on model)
Made of a recyclable plastic
IPX4 degree of protection
Notes on Installation:
The DAFI energy-saving water heaters can be installed above or under your basin or sink.
Shower installations are also possible, but never inside the shower cubicle. Installation of your water heater in the ceiling or behind the wall, or in a cupboard next to the shower should be considered.
Installation Requirements:
The DAFI water heaters must be installed as close to the point of use as possible to minimize pipeline heat loss. Water pressure must not be less than 60kPa (0.6 bar) and not exceed 600kPa (6bar). If water pressure is too high, a pressure reducing valve must be installed. Water quality e.g. mains supply, borehole, river etc. Should water quality be suspect, a filter must be installed. Single phase or 3 phase power supply with own isolator switch must be available as close as possible to point of usage.
Installation Procedure:
Installing the DAFI energy-saving water heater is not complicated, but it needs to installed by a professional plumber and electrician for problem-free operation.
Water supply:
To be undertaken by a qualified Plumber
Incoming water supply should be clean and without any suspended solids or organic materials.
The "static" incoming cold water supply pressure to be accurately measured to ascertain operating conditions.
The maximum operating pressure of all DAFI Heater models is 600 kPa (6 Bar).
A suitable Pressure Reducing Valve is to be installed before the heater unit, should this 600 kPa limit be exceeded.
Heater manifold nut assembly must only to be tightened with the spanner supplied in each box.
All air to be vented from the heater unit prior to connecting the 230 volts 50 Hz power supply.
A cut-off valve should be installed on the water inlet line to the DAFI heater.
All heater units for under sink installation can be installed at any angle.
Recommendations:
Installing a composite pipe from your DAFI water heater to the point of use will further reduce heat loss and save more energy.
For optimum performance enhancement Spray Nozzle provided should be attached to tap.
For models 3.7 kW & 4.5 kW Spray Nozzle is highly recommended.
Spray Nozzle spread water and rising pressure of hot water.
Beware of over tightening, use the plastic key provided. Do not use metal spanner!
For performance see table FT - flow/temperature
Tips:
1.Each installation is individual. Performance of Dafi Heater depends on voltage drop, the temperature of cold water, pressure, type of taps, the distance of installation from point of use, etc. Selection of right power should be done by experienced and competent trade person.
2. Before you buy to check if obtained flow corresponds to your demands.
Electric supply:
To be undertaken by a qualified Electrician.
1. Each heater unit is to be wired to the Distribution Board via the existing Earth Leakage System. Minimum 3 core cable sizes* - 2.5mm² for 3.7 kW & 4.5kW (230V) - 4 mm² or 2x2.5mm²(ring) for 5.5 kW & 7.3kW - (230V) - 2.5mm²
2. A dedicated suitably sized breaker to be installed on the Distribution Board for each heater unit.
3. A suitable sized 2 pole electric isolator (not fuse spur) to be installed.
4. DAFI heater units are not to be connected to the electrical supply by standard BS 1363 wall plug.
Instructions for first use:
1. Before connecting the DAFI heater into electrical grid water must flow through the heating element for approx 1 min. It must be done by turning the hot water knob on.
2. The unit is now ready to be connected to electricity, provided the above-mentioned action has been performed
Instructions for use in case of water shortages:
1) Disconnect the heater from electrical grid
2. Before reconnecting the DAFI heater into electrical grid water must flow through the heating element for approx 1 min.
It must be done by turning the hot water knob on.
3. The unit is now ready to be reconnected to electricity, provided the above-mentioned action has been performed.