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.
Does a combi boiler need an expansion tank?
On the central heating side, combi boilers pump the water round the heating system in a completely sealed system. The boiler incorporates an expansion tank internally, so there is no need for an external feed and expansion tank in the loft, which obviously saves a great deal of space.
How do you check boiler expansion tank pressure?
There are two valid checks that can be made on the pressure of the air charge in an internal diaphragm or bladder type expansion tank on a heating boiler: Disconnect the expansion tank completely from the heating system and then measure air pressure using an accurate air pressure gauge at the tank’s air valve.
How much does it cost to replace a boiler expansion tank?
Boiler Replacement Costs by Part
| Part | Estimated Cost |
|---|---|
| Expansion Tank | Gas: $40 – $250 Oil: $90 – $230 Electric: $50 – $240 |
| Pipe | $10 – $30 per linear foot |
| Circulator Pump | $150 – $700 |
| Ignitor Switch | $50 – $350 |
Do expansion tanks need to be drained?
At least once a year, and sometimes twice a year, the expansion tank should be drained. This will help to keep the air pressure that is necessary for the boiler system to maintain a healthy level keeping your hot water unit working properly.
How do I know if my boiler expansion tank is bad?
If it makes a dull thud rather than a hollow sound, your tank is full of water and needs repair or replacement. You can also gauge this by feeling the tank, which will be cool where it’s holding air and warm where it’s holding water. If more than half the tank is warm, you have a problem.