Manufacturers, Wholesalers & Repairs of a wide range of industrial & domestic geysers,Tea Urnes and Safety Trays
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NO HOT WATER
NOT ENOUGH HOT WATER
NO WATER COMING FROM HOT WATERTAPS
CONTINUOUS OVERFLOW OF WATER FROM HOT WATER INSTALLATION
GEYSER APPEARS TO LEAK FROM CASING
GEYSER TRAY
GENERAL INFORMATION
 
 
Manufacturers, Wholesalers & Repairs of a wide range of industrial & domestic geysers,Tea Urnes and Safety Trays
Welcome to City Heat Geysers.
 
The following inspection should be made:
 
  • Check the circuit breaker at the distribution board is switched on and that the isolator at the electric water heater is switched on.
  • Check switching times of the ripple relay; as this may have caused the electric water heater to have been switched off.
  • Check the house may have a load shedder and the electric water heater may have been switched off by the shedder.
If the above are all in order, either the thermostat or element is faulty and should be attended to by a qualified electrician.
 
 
  • Check the size of the electric water heater and the number of outlets which are being fed by the electric water heater, bearing in mind that a 1700mm bath, when filled to the overflow, holds 195 litres of water.
  • Check the thermostat setting and increase by 5 degrees Celsius until satisfactory temperature is reached.
  • Where a shower is utilised, the average showering time of each user, bearing in mind that the average shower rose can deliver between 15 litres and 20 litres per minute.
  • refer to the below table to determine the amount of water used per bath.
DEPTH mm HOT 70 Degrees C litre COLD 15 Degrees C litre TOTAL VOL: 41 Degrees C litre
250 92 103 195
200 73 82 155
150 54 61 115
100 38 42 80
 
 
Check that there is water supply to the electric water heater. All modern water heaters operate on a push through system, i.e. water can only be drawn off if cold water is introduced to it.
 
 
Exactly where overflow is released from:
 
  • the over temperature safety valve which will release water if the system is over-pressurized or the temperature of the water exceeds 94 degrees Celsius.
  • expansion relief valve which will discharge cold water from time to time.
 
The SABS colour codings are as follows:
 
Yellow = open vent cistern tank type, i.e. no pressure
Blue = 100kPa closed system
Black = 200kPa closed system
Red = 400kPa closed system
Green = 600kPa closed system
Brown = 300kPa closed system
 
If water drips from the expansion relief, try and determine the volume of water. Water expands when heated and the volume of expanded water is directly proportional to the size of the geyser and the thermostat setting. Expansion can vary approximately 5% of the volume of the geyser per day. If the volume expanding exceeds this, establish whether the house has balanced pressure.

The term "balanced" refers to the cold water take off after the pressure reducing valve. In an unbalanced system where common tap mixers or appliances are using hot and cold water simultaneously, cold water may tend to force the hot water back into the line which in turn will over pressurise the electric water heater and cause the expansion relief to flow.

The combined expansion relief pressure reducing valve can be serviced with replacement parts in the event of excessive release of water. The separate expansion pressure reducing systems are not generally serviced with replacement parts. Once again the expansion relief overflow and the safety valve outlet must be piped to the outside by means of metallic pipes, and insulated where freezing can occur.
 
 
Check :
 
  • that all plumbing connections are secure.
  • that the safety valve is piped to the exterior.
 
 
A Geyser tray must be installed with every hot water installation in compliance with SABS 0254.
 
 
  • A high pressure electric water heater may be operated at any pressure below its operation pressure, i.e. may be fed off a headertank for rural applications.
  • Please read all literature supplied with the electric water heater and store booklet in a safe place for future reference.
  • Always keep your proof of purchase which serves as your Warranty Certificate to assist us should you need to contact us.
 
In the event of the electric water heater having to be drained, proceed as follows:
 
  • Switch electrical supply off.
  • Switch water supply off.
  • Release pressure which may still be contained in the electric water heater by opening a hot water tap.
  • Connect a 3/4" hosepipe to the draincock connection provided.
  • Loosen hot water outlet pipe so that air can be introduced into the electric water heater.
  • Open draincock and allow electric water heater to drain to the exterior.