Canning household to CRA 20.7.17

gas hot water unit damage


Hi, I’m in Selwyn street, I switched to gas for my hot water, my water pressure was rubbish. Brand is Bosch, in use for about two years and had to have outside unit replaced, was told water is damaging the parts.

– Lorraine Canning from Somerfield

– Reply to our local inquiry via Neighbourly, CCC water burns Cashmere HWCs, noted at

M_______ household to CRA 15.7.17

repeated HWC and kettle element damage

Frequent HWC element burnouts in beautiful Bowenvale Valley

Starting to lose count of the number of elements we have needed to replace in our home – 1972 original HWC owned house since 1982 (35yrs).

Going back, say last 10-12 yrs – replacement element June 2006, Sept 2010, Feb 2011, new Rheem cylinder with new element July 2011, burnt out July 2015 and again May 2017!!! Thats more than enough replacements – haven’t added up the total cost of parts, van mileage, callout, labour etc.

Our electric jugs/kettles arent lasting and have had several Sunbeam plastic and s/s models replaced under Warranty or just out of Warranty period. Our current s/s Breville has been leaking water from base for several months until it got so bad needed to buy replacement last weekend! Still locating Warranty but when found (tonight?) we should obtain a refund under the CGA!

Also in recent months the inside of our electric jug is a daily, if not several times weekly, task to try to keep clean of scale! Even the new jug which is only 5 days old has signs of build-up already. Prior to this purchase, a retailer told us that a Warranty may not cover a leaking jug because of liquefaction getting into the water supply, but we didn’t have liquefaction from the quakes in our area!

– __b & __y M_______ from Cashmere, D_______d Drive

– Reply to our local inquiry via Neighbourly, CCC water burns Cashmere HWCs, noted at

Price household to CRA 14.7.17

titanium element much better

We were a rebuild (Brickworks Lane) and had a brand new cylinder. We went through three elements (One every three months). They finally replaced it with a titanium element on Christmas Eve! This seems to have fixed the problem.

– Michael Price from Huntsbury

– Reply to our local inquiry via Neighbourly, CCC water burns Cashmere HWCs, noted at

White household to CRA 14.7.17

gas-fired water system damage too

10 years ago we had trouble with corrosion with our Rheem gas water system while it was still under warranty. They said it was due to the water in these areas ‘hugging the hills’ and they’d had to replace several around here. We’re in Stanbury Avenue. They imported parts from Japan that were designed to cope with this water and, fingers crossed, it’s fine now.

– Tania White from Somerfield

– Reply to our local inquiry via Neighbourly, CCC water burns Cashmere HWCs, noted at

CCC email to CRA 13.7.17

Hi Rik

I’m not aware of any chemical analysis being undertaken in the Cashmere area since the testing we completed around September last year (reports attached). We do regularly test for bacteria as part of our ongoing monitoring just not any chemical analysis in this area. [Reports are here:
cashmere-drinking-water-2016-08-03-ccc-lab-report-160802001 155kB PDF]

It’s really important to note that you can’t read these results in isolation. What I mean by that is just because there is a specific result from one well that doesn’t mean you will be getting that same result in the street or through your tap. For example Spreydon Well’s 3, 4 and 5 all flow into a suction tank, from there the water is pumped into the network. Another point to remember is not all of these wells are run all the time. In my view we should be looking at the averages more so than individual results. This is especially true for ph. I would say the results for the three properties we tested would be the results to take most notice of. [Summaries here:]
Cashmere Water Sampling Results 2016 p1 of2
Cashmere Water Sampling Results June 2016 by CCC
Cashmere Water Sampling Results 2016 p2 of2
Cashmere Water Sampling Results Sept 2016 by CCC

Attached are two maps of the Cashmere area that should assist. When looking at them note that typically a reservoir doesn’t feed the zone it sits in, it feeds the next zone downhill. If you want a different view let me know and I can send you a different version. [Zoom view here:]
Cashmere Overview Map 2

In my view the water quality is very similar across all of Christchurch City, there are no specific locations or suburbs with known water quality issues.


Tim Drennan
Manager – Technical Services
Three Waters & Waste Unit

DDI: 03 941-8372
cell: 027 824 4592
Christchurch City Council
Civic Offices, 53 Hereford Street, Christchurch
PO Box 73015, Christchurch, 8154

CRA email to CCC 13.7.17

Good morning Tim Drennan,

Thank you, the help you provided last year was much appreciated. The Cashmere water quality debate has been quiet since then. But currently we are gathering reports again, of what local residents are experiencing in terms of water-related faults.

It seems that stainless steel hot-water cylinders do not function well with a standard heating element in our area. These last about six weeks, often. The question of whether the tank elements are fit for purpose is raised again and again. So there are some information items you might be able to help us with please:

1. Water test results from our local bores and reservoirs – all that have been done since the last we were sent, on 8.9.16 (from those results, a high pH in the Spreydon bore and the newest ‘Cashmere’ reservoir stood out for tracking – any comment welcome).

2. A mains network map showing what streets are supplied by what reservoirs, from Cashmere to Huntsbury.

3. Comment on any potential for adding improved HWC specifications to building consents or planning instruments in the afflicted area (collaborative research could define this, may include Beckenham and St Martins).

4. List of suburbs council knows to have problematic hard water.

5. Any other thoughts or details we may be missing in troubleshooting this aspect of the earthquake rebuild process.

Thanks again for being responsive and effective in your field of work. It adds a lot to what the community can do.


Rik Tindall


Ph: 332-1069

Cashmere Residents Association

Mentink household to CRA 12.7.17

stainless steel care needed, hard water

This is due to the stainless steel, not the water. This is the point of stainless steel, it is very resistant to corrosion but if it touches virtually any other metal, other than stainless steel (the same type of stainless steel mind you) then it will cause the other metal to corrode faster. This is when they are in physical contact and wet (the water acts as an electrolyte).

This is why you should never have copper, galvanised steel or mild steel in contact with stainless steel when they can get wet i.e. outdoors or in plumbing systems. If they are needed to be together, the two different metals need to be separated by an insulator such as plastic or rubber.

Many hot water cylinder elements are made with an Inconel sheath (a nickel alloy) which would be ok for a copper cylinder. They should really have a stainless steel sheath as the Inconel sheath is good for high temperatures but this not necessary for a hot water cylinder.

The Centaurus/Huntsbury water supply is definitely different to other parts of ChCh. We get lime scale in our kettle, which I have never had in any other suburbs.

– Geoffrey Mentink from Huntsbury

– Reply to our local inquiry via Neighbourly, CCC water burns Cashmere HWCs, noted at