The tanks are special tanks to fit in the space available. You will not get anything bigger in teh same space.
The fault is most likely with the 80% fill stop valve. It will be a standard valve so can be replaced but bear in mind the float valve must be removed first.
The poor consumption is most likely a installation issue with teh new front end and is also likely the cause of the gas smell. Go back and get them to look at it under teh warranty
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