We've been fitting accumulators for nearly 7 years and in the right scenarios, they work very well.
If you have 2.8 static on the ground floor an accumulator will make a significant improvement to the Megaflo (not the best choice of unvented) performance, in terms of dynamic pressure.
Your installer should be recommending this if he was keen and au fait with his trade.
It is not worth specifying an accumulator smaller than the GC450 as this gives a useful boost for about 220 litres. The next size down only delivers just over half this, and as iterated earlier the bag boost lowers as the accumulator unloads the water, so the GC450 stays in the sweet spot longer, if you get my drift.
You would be best advised to increase your pipe size from the accumulator to the UV cylinder. No point in spending all the money and then not giving it the best chance.
If you have 2.8 static on the ground floor an accumulator will make a significant improvement to the Megaflo (not the best choice of unvented) performance, in terms of dynamic pressure.
Your installer should be recommending this if he was keen and au fait with his trade.
It is not worth specifying an accumulator smaller than the GC450 as this gives a useful boost for about 220 litres. The next size down only delivers just over half this, and as iterated earlier the bag boost lowers as the accumulator unloads the water, so the GC450 stays in the sweet spot longer, if you get my drift.
You would be best advised to increase your pipe size from the accumulator to the UV cylinder. No point in spending all the money and then not giving it the best chance.