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

Dean household to CRA 12.7.17

titanium element under warranty, purify water

Hi, fyi we are the first occupiers of a brand new home on Cracroft Terrace. To our shock we woke up to no hot water within 6 months of moving in.

Our Peter Cock’s Ltd Silver Bullet, Stainless Steel 300 litre HWC heating element corroded through. We have a smaller 45L Rheem HWC for the kitchen with a Vitreous enamel cylinder which has lasted a year so far but that’s no testimony to longevity.

The plumber blamed the metals in our Cashmere water but got a sparky to replace the corroded element with a titanium one under warranty. Told us we should install a water purifying unit to solve the problem long term. Cost of the unit installed was quoted at around $2k. So far so good without the water purifier but I’m holding onto a piece of wood as I type. A mate up the hill has a 30+ yr old copper cylinder without a titanium element & has had no problems.

I think the problem is the Stainless Steel Cylinders with our Cashmere water don’t play at all well together. Suggest new home builders install gas HW or go for Copper cylinders if staying with electric. I’m also wondering what happens to expensive Coffee machines with stainless steel boilers. Cheers, Pete

– Peter Dean from Cashmere

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

Burgess household to CRA 11.7.17

every HWC fails on a 4-home site

We were the first tenants in the brand new townhouses on dyers pass & had the element replaced within 6 months. By the time we moved out after a year all 4 houses had had the elements replaced due to failure. I think silver bullet rings a bell.

– Tracey Burgess from Hoon Hay

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