Central Heater Pump For Water Circulation

Central heater pump is used to circulate hot water within houses. These small pumps are installed within the central heater systems in the house.

Hot water is an undeniable necessity that can never be considered a luxury. Lately, there’s been a general tendency towards using central boilers, as they use less power and give better inner appearance to the places. Nevertheless, central boilers need central boiler circulating pumps.

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Central heater pump

The central boilers’ pump makes sure that hot water continues to flow and circulates in the pipes all the time. So, if the tap is opened, hot water flows directly without needing to wait.

Not all types of water pumps can endure the high temperature of the boiling water, thus specific types of pumps are available for the central heating systems. The pump pulls the cold water in the pipes and replaces it with hot water continuously. So, with opening the tap the heated water flows instantly even at peak hours.  

The pump has a small size, and it’s usually loaded near the central heater.

The components of the pump

It consists of 5 parts:

  1. Water inlet valve or pipe.
  2. Water outlet valve or pipe.
  3. Electric connections box.
  4. Pressure adjust control unit.
  5. Pump bleed screw.

The latter two parts are seldom used and if needed, it is done by the hands of an expert.


The best central heating pump

There are plenty of options in the market when seeking a central heater pump; however, Al Lira Al Zahabiya Co. provides the best, the Rainbow brand.

The pump is of the code SR25/6G-180 mm and it is made of rust-resistant metals. The pump weighs 2.5 kilograms, has dimensions of 18×13×8.5 cm., and a port-to-port distance of 180 mm. These dimensions clarify how small the pump is, thus it can be loaded anywhere within the building without any problem.

The unit doesn’t need batteries as it works with electricity; yet, it rationalizes the consumption.

The price of this pump is 550 Qatari Riyal with installation and wiring included. Artec Water Technology Co. provides a one year guarantee upon the pump.

small water pump specifications

Rainbow brand central heater pump’s specifications

About the specifications, capacity, and efficiency of Rainbow’s centra; heating pump, they are as follow:

  1. Max. water flow: 6 cubic meters per hour
  2. Head maximum: 13 meters
  3. Temperature endurance: works with competence in high temperatures that vary between 25 and 110 degrees celsius 
  4. Max. pressure tolerance: 10 bar
  5. The body of the pump is made of rust-resistant metals
  6. Small-sized and easy loading
  7. Low noise-producing
  8. Low consumption of electricity
  9. Water rationalizing consumption
  10. The pumps support central boilers of capacity up to 300 liters
  11. IP rating: IP42
  12. The pump has a thermal overload switch for better safety


Types of water circulation pumps for central heater

The central heater pump has different characteristics resulting in the presence of a wealth of styles that fit the different needs.

Firstly, they differ in the alloy of manufacture, thus their endurance to high temperatures varies. Secondly, they differ in the power of the motor which leads to the difference in the head maximum. Thirdly, the difference within the source of power. Some pumps use batteries while others -which are the most common- use electricity. Fourthly, some pumps are single-headed and others are double-headed.

Finally, central heater pump types vary in the speed of water pumping. Some are single-speed or double-speed circulators and others are three-speed circulators. This type needs manual adjustment of the desired speed. The more modern types are highly efficient auto-adjusting circulators that don’t need any intervention.   


Types of Rainbow circulating pumps

  1. Double-headed pump, made of stainless steel (N), highly efficient auto-adjusting circulator.
  2. Central heating double-headed pump, made of bronze (B), highly efficient auto-adjusting circulator.
  3. Circulating pump with max. water flow of 4 cubic meters per hour, single-speed pump, and three sizes.
  4. Rainbow pump with max. water flow of 4 cubic meters per hour, three-speed pump, and three sizes.
  5. Central boiler water pump with max. water flow of 4 cubic meters per hour, single-headed or double-headed.
  6. Rainbow pump with a head maximum of 5 meters, three-speed circulator, and three sizes.


Indications of the presence of air-lock within the central heater pump

During the pump’s action, it produces only a low humming sound due to the low noise property it owns. Aside from that, it is normal for the pump to become touchably warm and not cause any harm when in action.

If the pump starts producing loud unusual noise or started being too hot accompanied by lack of efficiency and delayed hot water flow through the pipes to the taps, this means there is an air-lock inside the pump.

An air-lock interferes with the smooth water flow alongside causing water to bang the different parts of the water system. This air-lock has to be released; otherwise, the damage to the components or the pump can be permanent so they will have to be replaced.


Steps of releasing an air-lock from a central heater pump easily

  1. Turning off the power of the pump
  2. Leaving the pump to cool out if it is hot to avoid any danger
  3. Covering up any electric outlet with towels or cloth to avoid water contamination
  4. Turning off the water reaching the pump by shutting the general valve
  5. Removing the bleed screw gently and slowly using a screwdriver
  6. All the stuck air alongside some water will be released through the opening
  7. Water is to be dried and the screw is to be screwed back to its place
  8. Reconnection of the water and the power to the pump

If the problem persists or if there is no desire to deal with such procedures, maintenance is always there for such circumstances.

Another reason that may result in lowering the efficiency of the pump is the dirt accumulating inside the central boiler. If the problem remains after bleeding the pump, both the boiler and the reservoir must be cleaned by the hands of the professionals.

The central heater pump and the return line

 As the Rainbow brand pumps from Artec Water Technology Co. excel at electricity rationalizing consumption, they also are excellent at water rationalizing consumption. They accomplish this quality by the presence of the return line within the water system of the building.

Two water lines emerge from the reservoir, the first extends directly to the taps and it is responsible for the cold water flow while the other reaches the boiler. After heating the water to the required temperature, the pump -which is considered the heart of the heating system and its directing- pulls the water from the boiler through the pipes and to the taps through the hot outlets.

The unused hot/warm water alongside the cold water from the pipes continue to flow through the return line until they pour back into the central reservoir. The central heater pump creates a negative pressure at this side of the water circuit which helps the water to continue flowing quickly until reaching the central boiler again. This way, the pump accomplishes the continuous flow of the hot water as well as accomplishing water consumption rationalization through both the return line and avoiding the spilled cold water while waiting for the hot water to flow.


Frequently asked questions

Are Rainbow pumps for central heaters safe?

Yes, the pumps are very safe. They incorporate an overload switch for more safety. If the pump gets too hot, this switch cuts off the electricity from the pump.

What are the available sizes of the pump?

Central heater water pumps are available in three sizes which are small, medium and large. The first two are suitable for houses while the third is a better fit for facilities such as hotels and hospitals.

Does a central heater pump need batteries?

No, the pump uses electricity at 240 volts and 50 Hz. So, it doesn’t need batteries.

How do I know if the defect is within the central heater or the pump?

If the cold water flows for a bit followed by the hot water, then it is the pump. But if the cold water continues to flow endlessly, then it is the central heaters.

Similar topics:

Hot water circulation pump for heaters

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