Absolutely disgusting company. Been trying to switch suppliers for 4 months but as Avanti do not have the correct certification for the tank nobody will touch it. I’ve been ignored & lied to repeatedly. Having sent numerous emails to the complaints department I finally had a call back today after 6 weeks, and this was only due to the fact I’ve spent the last 2 days harassing them on the phone. Complaints department literally just told me today that the online complaints form they ask you to fill in doesn’t come through to them but to another department & they decide if it’s worthy of being sent up the chain…..it appears having small children & no gas doesn’t qualify as being worthy of being sent up the chain of command! Complaints guy admitted that they don’t have a copy of the correct paperwork but it has been done & the other companies should just take them at their word & accept the tank! When I pressed the guy about how bad they are & if he had seen any of the online reviews he honestly told me that all the bad stuff is recent & up until a few months ago they were a 5 star company! After this, several other lies & a general lack of any acknowledgment of their failings he then hung up on me!! I have just instructed Avanti to remove the tank & Calor are going to install a new one for £350…..I wish to god I’d done that at the start. Final point…..the reason I decided to leave them was because last year I ran out of gas mid winter. They said I’d have to wait several weeks for a refill. When I told them I had a small child in the house they then said I could get gas in 2 days…..if I paid them £200…. what a disgusting pile of trash they are. GOOD RIDDANCE.