Where does the expansion vessel go on an unvented cylinder?
It may be mounted to the top of the cylinder, or it could be attached in some other location. With some models, it is actually within the casing of the water heater.
Where do you put an expansion vessel on a heating system?
The Expansion Vessel must be fitted to the Return Side of the Central Heating System and in such a way that there can at no time be an obstruction between the vessel and the system.
Do you need expansion vessel on unvented cylinder?
Unvented systems are ‘sealed’, so they require an expansion vessel either next to or incorporated within the boiler or cylinder. An expansion vessel allows for the expansion of water in the system as it heats up, and accommodates the increase in pressure by up to 4.5%.
Does an expansion vessel have to be upright?
2 Answers. In general, the tank can be installed vertically above or below the plumbing, or horizontally. Typically, the tank is only required to be supported when installed in the horizontal position. Most smaller tanks are designed to be supported by the plumbing, when installed in the vertical orientation.
What pressure should a expansion vessel be set at?
1 bar
Expansion vessels, also known as expansion tanks, keep the pressure in a combi boiler stable while water heats and cools. They are typically located inside the boiler casing. The typical pressure a boiler system should be set to is 1 bar.
What pressure should my expansion vessel be?
Some important things to consider is the air pressure inside the expansion vessel. It rarely needs to be anything more than 1.5 bar in most domestic properties. Anything more and the water may not expand into the air at the required time and could risk the high pressure relief valve opening or worse.
Is an expansion tank really necessary?
An expansion tank is always highly recommended if you have a ‘closed-loop system’ caused by any kind of check valve or pressure regulating valve installed on your house’s water supply line. However, the long-term wear and tear of this excess pressure can reduce the life expectancy of everything in your plumbing system.
Do I need an expansion vessel?
As we all know, when water is heated it expands and wants to take up more volume. As the system is basically a closed loop, consisting of the boiler, pipework and radiators, it is necessary to provide some space for the water to expand into. This is why the expansion vessel is required.
Can an expansion vessel be installed horizontally?
Expansion tanks can be installed horizontally. The recommendation that they are installed vertically is to reduce stress on the (normally copper) pipe, which should be adequately supported even if the tank is suspended vertically.
What is an expansion vessel and how does it work?
When operating correctly, an expansion vessel will partially fill and empty depending on the demand and use of the hot water. In simple terms, this means that when hot water heats up in the hot water cylinder, it expands, and therefore needs somewhere to head for more space.
Where can expexpansion vessels be used?
Expansion vessels can normally be found in any hot water system where the water is pressurised. This means when the water supply is supply by a water system that is pressured such as mains water supply or boosted water supply. This shows us that expansion vessels can be installed almost anywhere from dentists to hotels, schools or care homes.
How long does an expansion vessel pressurized heating system take to install?
So an assessment for expansion vessel pressurized heating system can take anywhere between 30 minutes to 6 or 7 hours. It entirely depends on the size of your for expansion vessel pressurized heating system and the number of water assets you have such as cold water storage tanks, cylinders or combination boilers.
Why is the expansion vessel called a dead leg?
Often acting as a dead leg, no water passes through the expansion vessel, or away from the vessel, leading to stagnation and a good environment for bacterial growth.