That's the trouble with an internet forum.
Balenza can dole out advice whilst having no experience, and some poor chap could believe him. Add a few a few brickbats, and it looks like he has the tradesman's confident swagger.
If Doitall can see that an accumulator could help the OP, fair play to him.
Accumulators have a role to play and by the sound of it this chap on the side of a mountain may be able to benefit from one. For nth time I am not a GAH salesman and we do not directly sell accumulators of any type.
If Balenza has a mate with one that isn't working properly, rather than ignorantly blame the technology, it would seem more helpful for an expert (like himself) to investigate why it isn't working and solve the problem.
We were asked to look at an accumulator install in Wandsworth only last week, it was performing really badly. The system was poorly designed, and installed by someone with no idea what they were doing. Once the issues were fixed, the customer could not hold his hand under the bath taps.
No diggers were required, no big stilsons. Only our bill to be settled.
DIYers are generally gung ho positive types, luckily only the minority like to masquerade as experts on the internet. Perhaps Balenza is a JCB driver?