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. 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 volt or 400 volt 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.
Installing a composite pipe from your DAFI water heater to the point of usage 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 recomended. Spray Nozzle spread water and rise pressure of hot water.
Beware of over tightening , use plastic key provided. Do not use metal spanner! For performance see table FT - flow/temperature.
Performance of Dafi Heater depends on: voltage drop, temperature of cold water, pressure , type of taps, distance of instalation from point of use, etc. Selection of right power should be done by experienced and competent trade person. To be undertaken by a qualified Electrician. 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 for 7.5kW these models is two phase no neutral -(400V). 4 mm² 9 kW & 11kW these models are two phase no neutral -(400V). Size of cable need to be confirmed with installation method and voltage drop. Models 7.5 kW - 11kW are non-domestic unles three phase supply system in property.
Any combination of two phases no neutral (eg brown/black=400V). A dedicated suitably sized breaker to be installed on the Distribution Board for each heater unit. A suitable sized 2 pole electric isolator (not fuse spur) to be installed. DAFI heater units are not to be connected to the electrical supply by standard BS 1363 wall plug. 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 reconecting the DAFI heater into electrical grid water must flow through the heating element for approx 1 min. 3 the unit is now ready to be reconnected to electricity, provided the above mentioned action has been performed. DAFI WATER HEATER - In-Line model. DAFI WATER HEATER - Flexible model. If you receive a faulty item , simply return it back within 14 days so we can dispatch you another One. Return items must have all original packing. The item "7.3 kW 230V Instant Water Heater Dafi In-Line Under Sink" is in sale since Sunday, August 9, 2020. This item is in the category "Home, Furniture & DIY\Heating, Cooling & Air\Heaters & Radiators\Water Heaters\Tankless Water Heaters". The seller is "fabhome1" and is located in Selby, North Yorkshire. This item can be shipped to United Kingdom, Antigua and barbuda, Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Australia, United States, Bahrain, Canada, Brazil, Japan, New Zealand, China, Israel, Hong Kong, Norway, Indonesia, Mexico, Singapore, South Korea, Switzerland, Taiwan, Thailand, Bangladesh, Belize, Bermuda, Bolivia, Barbados, Brunei darussalam, Cayman islands, Dominica, Ecuador, Egypt, Guernsey, Gibraltar, Guadeloupe, Grenada, French guiana, Iceland, Jersey, Jordan, Cambodia, Saint kitts and nevis, Saint lucia, Liechtenstein, Sri lanka, Macao, Monaco, Maldives, Montserrat, Martinique, Nicaragua, Oman, Pakistan, Peru, Paraguay, Reunion, Turks and caicos islands, Aruba, Saudi arabia, South africa, United arab emirates, Ukraine, Chile, Bahamas, Colombia, Costa rica, Guatemala, Honduras, Jamaica, Kuwait, Panama, Philippines, Qatar, Trinidad and tobago, Uruguay, Viet nam, Russian federation.