What are the advantages of a sealed and pressurised radiator system over a vented system.
The obvious one is that there is no need to install a header tank.
But for houses where a feed and expansion tank can be installed what is the advantage of having a sealed system with the necessary safety devices when it comes to the task of transferring heat from the flames in the boiler to the air in the rooms. ?
The only one that I can see is that pressurised water will be less prone to kettling in the boiler's heat exchangers thus making them a bit more efficient. How much extra efficiency will be gained ? Is that worth the additional safety devices and their on going inspection, test and maintenance costs that the owner will have to pay during the life of the system.
How does a heating technician test that a pressure relief valve will open when it should ?
kettling = bubbles of water vapour forming on the hot surface that the water is in contact with
The obvious one is that there is no need to install a header tank.
But for houses where a feed and expansion tank can be installed what is the advantage of having a sealed system with the necessary safety devices when it comes to the task of transferring heat from the flames in the boiler to the air in the rooms. ?
The only one that I can see is that pressurised water will be less prone to kettling in the boiler's heat exchangers thus making them a bit more efficient. How much extra efficiency will be gained ? Is that worth the additional safety devices and their on going inspection, test and maintenance costs that the owner will have to pay during the life of the system.
How does a heating technician test that a pressure relief valve will open when it should ?
kettling = bubbles of water vapour forming on the hot surface that the water is in contact with
