New Zealand Law
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The issue with the repairs and/or replacement is covered under the Consumer Guarantees Act. So any appliance which is sold to a domestic consumer like you is covered, because it must be fit for purpose and reliable in performance. The next issue is the normal lifespan of the appliance. Some things like a fridge can be expected to last at least 10 years. A gas fire should likely have a similar lifespan, if not longer. If the repairs continue to be temporary, as the history you describe sets out, then there may come a point where replacement is the correct remedy. You can ask both the retailer and the manufacturer to help and I would suggest start with a request for replacement. If they refuse but offer to repair, then this may be an option and you could get some extra warranty over work,. If they decline to discuss this you could make a claim to the Disputes Tribunal, for replacement.
If the retailer company is no longer is trading, then you will need to see if the group will accept liability, or claim against the manufacturer. You will need to try to identify who the retailer was when this was sold. If in fact it was part of the group then they are still liable however
You need to contact the NZ wide group as they sold this to you. The new company would not be liable unless they adopted the maintenance contracts of the NZ group, but the national group is the one to be contacted.