Surrey Flange-Everything You Need to Know

Ordinary bathrooms have water pumps and hot water cylinders. They are connected by a pipe to enable them to perform their duty correctly. A flange is a fitting input between the hot water cylinders from getting into the pump, thus preventing air from getting into the tank.

There are several types of flanges. Typically, some of the most common flanges include Surrey flanges, Warix flange and non-Essex flanges.

What is a Surrey flange?

A Surrey flange is also known as a Danzey flange. This flange is used to release air out of hot water before it goes through the outlet around it. Its primary purpose is to connect the hot water supply to the water pump or pipe. It is designed to provide an independent hot water supply, whilst reducing the air leakage, noise, and temperature changes.

It acts as a valve that only lets in the water while blocking the air from getting into the pump. The air vent on the flange cleans the shower circuit to prevent air accumulation in the hot air feed.

What makes this flange unique is that it can withstand the high pressure of up to three bar pressure. Unlike other flanges, the Surrey flange is a top entry flange; meaning that it is screwed at the top of the hot water cylinder. The flange is suitable for use in instances where the pump is fitted above the tank.

Surrey flanges heads are typically used in showerheads and other water installations. But what makes this fitting so popular? Well, here are the benefits of a Surrey flange:

  • It prevents unnecessary, sudden temperature variations in the water so that your bathing is not interrupted by sudden hot or cold water.
  • By reducing the noise produced in the tank, a lot of vibrations are reduced, which would otherwise accelerate the cylinders degradation and eventual leaking.
  • An aerated pump is a ticking time bomb, and in no time it will break down. However, the fitting prevents such a disaster by stopping air from entering into the pump.
  • Some salamander pumps require the fitting of flanges to safeguard the warranty.
  • The fittings also help the tank from overflowing as it controls the amount of water getting in.

Due to the above benefits, the Surrey flange will keep your pump in good condition for many years. The Possibility of cavitations in the pump is lowered by this fitting which filters out all air from the hot water.

How Does a Surrey Flange Work

As you can see, a surrey flange prevents devices like shower pump from air damage. But, the question is, how does it exactly do that?

  • A Surrey flange works by drawing off the water via a pipe that dips down in the main body of the hot water.
  • Air bubbles are created when the water found in the cylinder is heated by either the immersion heater or coil.
  • The cylinder’s top is shaped like a bell, it’s used to prevent the air bubbles from being trapped. This means that bubbles can rise to the highest point possible within the cylinder, and out of the top.
  • The hot water below the point in which the bubbles rise protects the shower pump from any damage. Also, the pipe that dips into a cylinder may have elements on the end that deflect any air bubbles that may rise towards it.
  • Surrey flange has two outlets. An Aerated water hikes to the top of the cylinder as well as out of the flange.
  • Then there’s the non-aerated water that exits at the right angles to the dip tube.

How to Fit a Surrey Flange

Since we already know what a surrey flange is and how it works, it is time to install one so you can enjoy the benefits! It’s not rocket science, you don’t necessarily need to have plumbing background in order to fit the flange.

Fitting a flange is relatively easy, all you need are some plumbing tools and a bit of PTFE or Loctite glue. The process is simple and can be completed in the ten easy steps outlined below;

  1. Disconnect the hot tank from the main water supply. You do not need high-pressure hot water disrupting you or stalling the installation process.
  2. Open the hot water pipes and discharge all the water in the hot tank. You can let the tank cool off before continuing.
  3. When you are sure that the tank is safe to work on, unscrew the compression fitting on the top of the tank.
  4. Prepare the Surrey flange for installation by cutting a small section of the outlet pipe. Cut the pipe backwards.
  5. Using Polytetrafluoroethylene (PTFE) or Loctite super glue seal the threaded joint at the top of the hot air pump. PTFE and Loctite are chosen since they make the tank airtight and for the water resistance.
  6. Mount the Danzey flange onto the hot water tank and fasten it to attach firmly.
  7. Connect the side outlet of the flange to the shower pump. Use the PTFE or Loctite to ensure that the connection between the flange and the water pipe is watertight.
  8. Connect the flange to the hot air pipe you cut back in step 4. This pipe reconnects the hot air pump to the rest of the hot water system in the house.
  9. Make sure the hot air pipes are shut before doing the next step.
  10. Open the feed to the hot water tank to ensure that the tank is watertight, and repair avoid leakages.

Surrey Flange Installation Diagram

How to Fit A Surrey Flange Video?

In case you have had a hard time following the installation guide, here is an easy to follow video to help you install the surrey flange. Watch and learn after watching the video, you will be able to fit any Flange.

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