how much can i expect to pay?

Generic vessels are in general, cheaper than manufacturers specific vessels.

There is no hard and fast rule on replacing or renewing, if you fit a new vessel rather than replacement, ensure it has the capcity to deal with the system requirement (10 ltrs should be good for a standard type system).

Price? Retail and trade would be very different, look around on the net for a guidance.

Carefree
November 2010