Comparison Between High Pressure and Low Pressure Systems

 
 High Pressure Systems Low  Pressure Systems
Black & White Series  Green & White Series Black & White Series Green & White Series
Models Available




 
- - 50 Litres - 6 x 1.8m Tubes -
100 Litres - 12 x 1.8m Tubes 100 Litres - 10 x 1.8m Tubes 100 Litres - 12 x 1.8m Tubes 100 Litres - 10 x 1.8m Tubes
150 Litres - 18 x 1.8m Tubes 150 Litres - 15 x 1.8m Tubes 150 Litres - 18 x 1.8m Tubes 150 Litres - 15 x 1.8m Tubes
200 Litres - 24 x 1.8m Tubes 200 Litres - 20 x 1.8m Tubes 200 Litres - 24 x 1.8m Tubes 200 Litres - 20 x 1.8m Tubes
250 Litres - 30 x 1.8m Tubes 250 Litres - 25 x 1.8m Tubes 250 Litres - 30 x 1.8m Tubes 250 Litres - 25 x 1.8m Tubes
- 300 Litres - 30 x 1.8m Tubes - 300 Litres - 30 x 1.8m Tubes
Price A low price for the type of geyser but still in the more expensive class Roughly half the price of the high pressure systems
Guarantee  5 Years if installed according to specification 2 Years if installed according to specification 5 Years if installed according to specification 2 Years if installed according to specification
Choice 
 
If you want to keep your municipal or pressure pump pressure, a high pressure system is the better choice. You will have less available hot water compared to the low pressure systems, because high pressure geysers do not store hot water in the tubes like low pressure systems.  If you want a cheap system that works very well the low pressure system is the better choice. Keep the flow in mind, especially if there are 15mm plumbing pipes between the geyser and the bath, and when you want a 22mm flow at the tap. One lever mixer taps will restrict flow substantially. Two knob mixers do not cause flow problems easily.
The Tank
Outer tank material & insulation Both the high pressure and the low pressure tanks are the same.
Heat retention Because the tank is closed, heat retention is better than the low pressure system There is a breather in the tank which causes more heat loss than with a high pressure system
Inner tank material 1.2mm Stainless steel tank  1.2mm Stainless steel tank  0.4mm Stainless steel tank 0.3mm Stainless steel tank
Weight These tanks are heavier and can weigh up to 50kg These tanks are lighter and easier to install and can go up to 40kg 
Magnesium Anode These is exactly the same. As with any other geyser, regular replacement of the anode makes the geyser last much longer because it reduces rust substantially 
Pressure  600kpa  500kpa Designed to use as gravitational pressure from the water level in or above the tank. All air vent should be open.
The Evacuated Tubes 
This is a standard 1800mm length x 58mm diameter x 2mm thick glass tube. These tubes are designed to withstand 38mm diameter hailstones. 
Heat pipe inserts  Heat transfer into the high pressure tanks is done with copper heat pipes. Heat pipes utilize a liquid which boils and condenses, thus causing an effective heat transfer cycle. There is no heat pipe in a low pressure vacuum tube. The water from the tank circulates directly between the inner glass tubes and the tank using convection. 
Water inside the tube There is no water inside a high pressure vacuum tube. Thin aluminium plates and heat pipes transfer the heat from the hot black inner vacuum tube to the tank. Inside the vacuum tubes there is only water. The heat energy is transferred directly to the water inside the tubes. 
The Stands
These stands are very similar in both low pressure and high pressure system. 
From 50L systems to 150L systems This stand is black in colour  This stand is green in colour  This stand is black in colour This stand is green in colour
Four cross braces at the back of the stand (under the tank), two cross braces at the front of the geyser and one cross brace on each side. Six of these cross braces are the same length whereas the two longer braces will be used for each side. The slotted beam for the plastic cups holding the glass tubes is  at the bottom, of the stand.  Four cross braces at the back of the stand (under the tank), two cross braces at the front of the geyser and one cross brace on each side. Six of these cross braces are the same length whereas the two longer braces will be used for each side. The slotted beam for the plastic cups holding the glass tubes is  at the bottom, of the stand. Four cross braces at the back of the stand (under the geyser) and two cross braces at the front of the geyser and one cross brace on each side. Six of these cross braces are the same length whereas the two longer braces will be used for each side. The beam for the shiny end of the vacuum tubes is at the bottom of the stand. There are no plastic cups. Four cross braces at the back of the stand (under the geyser) and two cross braces at the front of the geyser and one cross brace on each side. Six of these cross braces are the same length whereas the two longer braces will be used for each side. The beam for the shiny end of the vacuum tubes is at the bottom of the stand. There are no plastic cups.
From 200L systems to 300L systems Painted black. Painted green Painted black Painted green.
Three upright legs instead of two like on the smaller systems Three upright legs instead of two like on the smaller systems Three upright legs instead of two like on the smaller systems Three upright legs instead of two like on the smaller systems
Roof strengthening These stands are well designed. The weight is well distributed among the feet.
Electric Backup System
This is optional with any of our  solar systems. A standard 32 mm screw in South African electric element with a pocket is used. It can be controlled with either a thermostat or a SR609 programmable controller.
The SR609 Programmable Electronic Control Panel
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It shows current water temperature, and

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the time.

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It can be set to heat the water in the tank electrically in three cycles of time and temperatures.

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Default: if the water is cooler than 54oC between 4 and 5 am, the water will be heated to 60oC. The same happens between 5 and 10pm again.

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A manual button raises the temperature up to the programmed temperature (usually 60oC), whenever needed.

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There is a battery backup, so it will not forget its settings.

Disadvantages 
 
To keep the pressure, a litre of cold water must replace every litre of hot water used. This means that the water temperature comes down as water gets used. If both the outer and inner tubes break, the water in the tank will run out. This very seldom happens. The system will only work if all the tubes are installed, or if the holes of the broken tubes are plugged. (A  "Brutal Fruit" bottle has the same diameter)
The more expensive one of the high pressure systems  More expensive than a low pressure system but more affordable than the Black and White Series 

The water pressure is lower at the outlets than the pressure obtained with a high pressure system. Because flow is more important than pressure, plumbing pipes must not restrict flow

CONTACT DETAILS

Landline

0860 SUNPAY

0860 786 729

012 734 0915

Mobile

082 515 1655

E-mail

sunpays@hotmail.com

sunpays2@hotmail.com

Physical address

Corner Ross and Short Streets

Cullinan

Operating Hours

Monday - Friday : 07:30 - 16:00

Saturday : 07:30 - 13:00

GPS Coordinates

S25.68027         E28.52323

S25o40.81620      E28o31.39380

S25o40'48.972"    E28o31'23.628"

 

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Copyright: The Sun Pays 2014

Designed and maintained by Sanet Strydom - DesignDynamics -http://www.designdynamics.co.za -studio@designdynamics.co.za

Solar, vacuum, panel, cullinan, sonkrag, quality, geyser, pump, price, sunpays, solar geyser, water heat, low cost, low pressure, high pressure, stainless steel tanks, glass tubes, vacuum tubes, evacuated tubes, the sun pays