GWS vs Reliance - Accumulator

[fezster]

Does anyone have experience of either of these?

Reliance – Aquasystem 500 Litre Potable Expansion Vessel XVES050150
£660

GWS Challenger 450L Accumulator Tank
(same as Stuart Turner Mainsboost 450SV?)
£690

Both are similarly priced.

The reliance has a replaceable membrane.
The GWS has a 5 year warranty. Unsure if replaceable membrane.

Mainly thinking about longevity, rather than performance (which I assume will be identical).

 

[snowhead]

The GWS is a Fibreglass shell so won't corode, as the steel ones tend to do, if the membrane splits.

GWS don't say, but the liner must be removable / replaceable due to the way the shell is made, it's spun fibreglass so will be formed around a removable inflatable liner.
I wouldn't put too much reliance on the 5 year warranty, "it's been overpressure" is likely to be a get out for a split membrane.