Tag Archives: submersible pump

Maris Pumps Ltd looking to the future after becoming a Flygt distributor

Flygt Ready Submersible PumpMaris Pumps Ltd is celebrating with news of becoming a Flygt distributor. The world’s premier manufacturer of Submersible pumps and mixers have teamed up with Maris Pumps Ltd to strengthen the business and offer a more enhanced service of the Flygt product to existing and new customers.
Under the Flygt banner, customers have access to a complete range of products and solutions for moving water, wastewater, and advanced monitoring and control equipment to optimize their use.
Maris Pumps offer a large range of Flygt products with free next day delivery, including SX, DX & DXV Stainless Steel Submersible Pumps, Flygt Ready Submersible Drainage Pumps and the Flygt 2000 & 3000 Series Submersible Pumps.

This news comes soon after Maris Pumps Ltd became an approved Trelleborg distributor and the first company in the UK to sell the new pipe stopper products from the world-wide brand. This is a huge milestone in Maris Pumps’ growth.
General Manager Steve Mosley commented “This is fantastic news for our company at a time or rapid growth and a relationship which we feel will be beneficial to both parties who share a passion and determination to offer effective solutions in the transport and treatment of water and wastewater”.
Since its formation in 2003, Maris Pumps Ltd has provided a genuine 24 hour pump hire service to the construction, water and civil engineering industries. Their fleet of pump hire equipment, backed up by years of experience, enables you to get the right pump for the application, first call, every time.

Visit our Flygt range here.

For more information on Flygt or any of our products, call us on 01246 201111 or email us sales@marispumps.com.

Introducing Zenit to our Submersible Pump range!

Zenit DRWe are delighted to announce that we now have new Zenit submersible pumps available direct from our website! The fantastic products include the DR Blue Pro, DG Blue Pro, DG, DGO and DGN ranges for drainage and sewage use.

We stock a great range of Zenit pumps in 110V, 230V and 400V with single & 3-phase configurations, all available with free, next-day delivery!

View the new Zenit Subemersible pump range here

What is a submersible pump float switch and which type do I need?

When researching which submersible pump to buy, you will inevitably see pumps which are available with numerous types of float switch, here we’ll describe their operation and two of the most common types.

Mac-3 Pendant type Float SwitchA float switch is a mechanism used to detect the level of water around a submersible pump, allowing the pump to operate automatically – when the water reaches a certain pre-set depth the float switch will trigger the pump to switch on and start pumping. When the water level drops below another pre-set level, the pump will then be turned off automatically and stops pumping.

This automatic operation ensures that the pump will never “run-dry”. The electric motor in a submersible pump is normally water cooled – the action of pumping the water through the pump body keeps the electric motor within normal operating temperatures – when there is no water present, the pump could run-dry and overheat, cause damage to the motor.

Operation of a pendant type float switch in a sump

The submersible pumps we stock can be supplied with a float switch for automatic operation, or without a float switch for manual operation.

For most of our pump range, there are two options for the type of float switch: a free-moving float attached to the pump via an electrical cable, or a tube float which is normally mounted on the side of the submersible pump.

Free-Moving Pendant type Float Switch

JS-250 Submerisble Pump with Mac-3 Pendant Float SwitchThe standard option is the free-moving pendant float – these are generally manufactured from tough polypropylene plastic with a micro-switch mechanism inside. When there is sufficient depth of water the air-filled bulb will float upwards, triggering the micro-switch to power up the pump. When the water has been pumped away and the level decreases, the float will drop, switching the pump off again. This type of float switch generally requires the submersible pump to be installed in a tank or sump and needs approximately 300 mm of space around the pump to operate properly. This ensures the float doesn’t get snagged or tangled on the sump or tank walls.

Tube-type Magnetic Float Switch

RS-150 Submersible Pump with Agma Magnetic Tube Float SwitchThe second option is the tube-type, or magnetic float switch. This is close-coupled to the pump body and has a float which slides vertically inside a tube – when the float is at the top of the tube, a micro-switch turns the pump on and when the float drops to the bottom, the pump is switched off. This type of float switch is ideal for installing pumps is space-limited areas, where a standard float switch wouldn’t have room to operate.


When purchasing a submersible pump keep in mind the intended use: a manual submersible pump will require you to switch it on and off when required. A submersible pump with a tube type float is ideal for automatic operation in small sumps, and the standard bulb, free-moving pendant float switch is suitable for most other applications requiring an automatic operation.

What is the difference between a Puddle Pump and a Submersible Pump?

A submersible pump is usually a small electric pump used for drainage duties. As the name implies, the whole pump can be submerged under water – in most cases this is necessary to keep the electric motor cool and prevent overheating.

Submersible Pumps

Submersible pumps can be manually or automatically operated. Manual pumps require the user to switch the pump on when required and off when the water has drained away (dry-running of a submersible pump will normally cause damage to its internals). Automatically operated pumps have a float switch (similar to a ball-cock in a toilet cistern) which switches the pump on and off at pre-set water levels. Submersible pumps with float switches usually require a certain amount of space around the float for it to operate and these work best in tanks or for drainage of cellars/basements in a sump (essentially a hole dug into the floor where water collects).

Submersible pumps will typically drain water down to a level of approximately 30 mm.

A popular example of a domestic-use submersible pump is the Pedrollo TOP range – you can see in the diagram below a typical installation in a sump, with sufficient space for the float to operate unobstructed.

Pedrollo TOP Submersible Pump installation in a sump

Puddle Pumps / Puddle Suckers

Puddle Pumps (also known as Puddle Suckers) are submersible pumps with the ability to drain down to very low levels (typically as low as  1mm, and so can be fully or partially submerged). They are usually manually operated (no float switch) and are ideal for draining water from flat surfaces such as roofs, car-parks and cellars.

Puddle Pump in Cellar

Automatic operation is an option for some puddle pumps in fixed installations through the use of a capacitive water sensor and control unit.


A Puddle Pump is really just a type of submersible pump with a specifically designed impeller and strainer to allow for low-level drainage applications on flat surfaces.

Our two best-selling puddle pumps are the Pedrollo TOP Floor, which pumps down to 2mm and is ideal for domestic drainage duties, and the RSD-400 Puddle Pump, a higher performance pump which drains down to 1mm and due to its stainless steel construction is suitable for domestic and on-site drainage.

See our full range of submersible pumps.