The vent pipe on the top of the geyser tank must always be open to the atmosphere. These systems boil easily, and the steam must escape.

Do not use any valve or restriction on the vent pipe. This will void any guarantee.

When connecting inlets and outlets, remember that the stainless steel tank is only 0,41mm thick. Do not over tighten.

With no electric element installed:

Manual filling:  Click for diagram

• Connect a pipe to the bottom male thread (marked “Outlet”). This pipe can then act as both an inlet and outlet pipe.
• A Tee coupling is connected in the pipe.
• One end of the Tee gets connected to a valve and the cold water supply.
• The other end of the Tee gets connected to the hot water outlets.
• In the morning, while the hot water taps are closed, open the inlet valve and let the water fill the tank until it runs out through the vent.
• Close the inlet valve. The tank is full.
• Let the water heat during the day.
• In the evening or early morning, when the outlets are opened, the tank runs empty without cold water entering, as happens with the automatic filling methods.
• This way, there is more available hot water.
• There will be no damage to the geyser if it runs empty, because the tubes stay full of water.
• At installation, or when the vacuum tubes are allowed to boil dry, (usually after the tank was empty for a few days), do not pour cold water into the geyser in daytime, because adding cold water into hot, dry glass tubes will shatter the tubes.

Notes:

• This method can be automated using a day/night switch together with a Latco valve or auxiliary tank.
• Using a SR500 or TK-7 controller, this can be done electronically. Users just have to make sure they understand the settings.

Bottom of supply tank just above geyser tank: Click for diagram

• The top of the vent pipe must be at the same height as the top of the supply tank.
• The water level in the vent pipe on the geyser tank will be the same as in the supply tank.
• No Latco valve or auxiliary tank is used.
• Pressure will be balanced at the shower.
• The 22mm inlet is at the top and the 22mm outlet is at the bottom, as marked on the tank. The cold water runs out first, but the outflow is better, because the tank can run empty. There is still hot water available when the supply tank is empty.
• There will be no damage to the geyser if it runs empty, because the tubes stay full of water.
• At installation, or when the vacuum tubes are allowed to boil dry, (usually after the tank was empty for a few days), do not pour cold water into the geyser in daytime, because adding cold water into hot, dry glass tubes will shatter the tubes.

IF: 

1. the bottom of the supply tank is 3 to 5 metres above geyser tank: (when the vent pipe is longer than 1.5m, and thus too long to be stable) or

2. the pressure difference will be so small that it will not significantly effect the mixing at the mixing valve, or

3. if there are no mixing valves, and a difference between cold and hot water is acceptable,

   there are two options:

1. Auxiliary tank: Click for diagram 

• It is a 3 litre tank with a ball valve, like a toilet cistern, used to bring down the pressure and keep the geyser tank full.
• The auxiliary tank cannot be used to balance pressures for the mixer valve (shower)
• If you have no mixing valve in the house, and differing pressures at the hot and cold outlets is not a problem, it can be used to install where the inlet pressure is high.
• If the hot/cold pressure difference (difference in head) is small, there should not be serious problems at the shower.
• Using a 22mm to 15mm reducer, the auxiliary tank can be fitted on the inlet, with a short vent pipe on the 15mm vent. (if you do not have a reducer, the two pipes can be switched.)
• The 22mm inlet is at the top and the 22mm outlet is at the bottom, as marked on the tank. The cold water runs out first, but the outflow is better, because the tank can run empty. There is still hot water available when the supply tank is empty.
• There will be no damage to the geyser if it runs empty, because the tubes stay full of water.
• At installation, or when the vacuum tubes are allowed to boil dry, (usually after the tank was empty for a few days), do not pour cold water into the geyser in daytime, because adding cold water into hot, dry glass tubes will shatter the tubes.

2. 100kPa adjustable Latco valve (Black an white valve): Click for diagram 

• It can be bought from The Sun Pays or from the local hardware store.
• A Latco Valve can be used to equalise the pressure for the mixer valve (shower)
• If the valve is used to equalise the hot and cold pressure, the cold water is taken off on the low pressure side of the Latco Valve.
• The 22mm inlet is at the top and the 22mm outlet is at the bottom, as marked on the tank. The cold water runs out first, but the outflow is better, because the tank can run empty. There is still hot water available when the supply tank is empty.
• When the Latco valve is installed, adjust the white ring on the Latco valve so that the water runs out at the top of the vent pipe, and then back, so the water level is in the vent pipe.
• There will be no damage to the geyser if it runs empty, because the tubes stay full of water.
• At installation, or when the vacuum tubes are allowed to boil dry, (usually after the tank was empty for a few days), do not pour cold water into the geyser in daytime, because adding cold water into hot, dry glass tubes will shatter the tubes. 

With electric element installed:

1) Bottom of supply tank just above geyser tank: Click for diagram 

• The top of the vent pipe must be at the same height as the top of the supply tank.
• The water level in the vent pipe on the geyser tank will be the same as in the supply tank.
• No Latco valve or auxiliary tank is used.
• Pressure will be balanced at the shower.
• The inlet is at the 22mm male thread (marked “Outlet”) at the bottom of the tank.
• The outlet is at the 22mm male thread (marked “Inlet”) at the top of the tank.
• This way, the tank cannot run dry, and the heating element will not be damaged.

2) 100kPa adjustable Latco valve (Black an white): Click for diagram 

• Latco valves can be bought from The Sun Pays or from the local hardware store.
• A Latco Valve can be used to equalise the pressure at the mixer valve (shower)
• If the valve is used to equalise the hot and cold pressure, the cold water is taken off on the low pressure side from the Latco Valve
• The inlet is at the 22mm male thread (marked “Inlet”) at the top of the tank.
• The outlet of the geyser tank is at the 22mm male thread (marked “Outlet”) at the bottom of the tank.
• An anti siphon loop, about 12cm higher than the outlet, must be connected to the breather pipe to protect the element.
• When the Latco valve is installed, adjust the white ring on the Latco valve so that the water runs out at the top of the vent pipe, and then back (