the megaflo is definatley a good choice if you have high hot water demand.
There arnt really any down sides i am aware of but im sure if anybody else reading knows of any they will post a reply
this is the specification that heatrae sadia offer for selection advice
also the heatrae cylinders have a 25 year warranty
Type of property Indirect
3 Bed 1 Bath+Shower CL145HE
4 Bed 1 Bath+Shower CL170HE
4/5 Bed 2 Bath+Showe CL210HE
4/5 Bed 3 Bath+Sho CL250HE
for further information visit our website
http://www.bhl.co.uk/category/Megaflo_I ... _Cylinders or give us a call on 08704586288