How do I know what size expansion vessel I need?
Sizing Guide: For systems with 82℃ / 71℃ flow and return and cold fill pressure up to 1.5 bar, a good rule of thumb is, 1 litre vessel capacity minimum per KW boiler output – round up to larger vessel capacity (e.g.160 KW boiler may require 200 litre vessel).
What pressure should a Vaillant expansion vessel be?
1 bar
Summary. 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 size potable expansion vessel do I need?
Potable Expansion Vessel Sizing Guide
| Cylinder Size | Expansion Vessel Size |
|---|---|
| 50-80 Litres | 8 Litre |
| 90-125 Litres | 12 Litre |
| 150-180 Litres | 18/19 Litre |
| 210-250 Litres | 24/25 Litre |
What PSI should my expansion tank be?
between 50 and 60 PSI
The recommended water pressure is between 50 and 60 PSI. Thermal Expansion Tanks contain an air bladder which is pressurized with air, and expands and contracts to absorb the expanded water from the water heater. needed.
Can you fit an expansion vessel on its side?
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 if my expansion tank is too big?
What Happens if the Expansion Tank is the Wrong Size? An expansion tank that is too large for your system will still be able to safely handle the extra water. However, a tank that’s too small can trigger the temperature and pressure relief valve to open so the excess pressure is relieved.
Do I need an extra 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.
Do I need a expansion vessel?
The reason that some heaters need to cope with this expansion is that when water is heated, it expands. If this is not allowed for then heater tanks or pipes will fracture and split, causing a catastrophic failure of the heater. So you only need to consider an expansion vessel if you have an unvented water heater.