It IS Low Risk Gasfitting Badger, and according to the three different graphs I have seen - all Low Risk work requires a Gas Safety Certificate.
For General and High Risk Work BOTH a COC and GSC are required.

I still stand by my assertion that ALL low risk work requires a GSC - "requires" is the word ESS are using in their material.  I don't think this is open to any interpretation. 

Go on line to www.ess.govt.nz  and look for Practitioner Guide to the Regulatory Changes for Certification of Gasfitting, the graph is on page two. 

Now, ask me if I think any gas servicing person WILL issue a GSC for replacing a thermocouple or gas valve - and the answer is probably not.  Ask me if I think the public will want to pay the service fee + the cost of a GSC - thereby probably doubling or trebling the cost of the initial job - and I will say - probably not.  The Government have, with the sweep of a pen, increased HUGELY costs to consumers when the initial reasoning behind ALL of this given two years ago, was that they wanted to reduce costs to consumers and simplify everything for tradespeople.

I am still laughing, then choking, then crying. Some jumped up idiot wearing a suit with a tie that was too tight, sitting in an office overlooking the CBD in Wellington with nothing better to do - has dreamed up this scheme.  I have no idea why, maybe they needed to keep their relation who worked in ESS in a job.

It just doesn't make any sense to any normal, practical person.

One thing I do know - with the Board like we have - it is better to always err on the side of caution.  Maybe even flood the high risk data base with every scrap of gasfitting you do.  See how their IT system and little men in suits cope with that.  Peaceful protesting.