Your new boiler is protected by a no quibble guarantee which you can extend to up to 10 years. Most boilers may need to be replaced after every 15 years - it may be better to purchase a new unit if older than 15 years. We’ve briefly touched on drain rods and caustic soda but what else do you need to unblock a drain? here’s our essential kit. At the mid – upper end of the market customers benefit from long term, no quibble guarantees, better life expectancies and.