I've asked our builder for upgrade options (not zoned) for our house. They provide a 3 star Brivis system as standard.
The options they provided are:
Brivis SP421UN (4.8 star) to 11 points c/w Networker Controlle - $1,231
Brivis SP521i (5 star) heating to 11 points c/w Networker Controller - $1,965
Brivis (6 star) heating c/w Networker Controller - $2,790 (didn't give model number.. I'm assuming it's SP623EN)
Is it worth spending the extra to get the 6 star, or would one of the first two options be good enough to run?
Has anyone got any of these systems? Are they any good? Do they use much gas anyway?