Answers to our most frequently asked questions.
- Most Methven products are suitable for all-pressure installations, so there’s no need to worry about water pressure.
- It is important, however, to check the technical details before installation, as not all products sold in NZ are all-pressure capable. If you need to determine what pressure system you have, it’s best to check the details on your hot water cylinder.
- The average shower uses 20 litres of water per minute. A Methven Satinjet shower, with a 14 litre flow restrictor, could save up to 27% of your hot water energy costs, and up to 30% of your total water costs.
- Better still, fit your Satinjet shower with a 9 litre per minute flow restrictor, and you could potentially save up to 49% of your hot water energy costs, and 55% of your total water costs. The Satinjet essentially pays for itself in a matter of months.*
- *Water flows on mains pressure cylinders vary across NZ. Not all water flows are on mains pressure, and low pressure will produce lower flow rates. The savings indicated are based on a typical mains pressure shower flow, of 20 litres per minute.
Because the fittings on most showers are universal, it’s usually easy to upgrade most showers to a Methven Shower fitting. There are, however, some exceptions with particular brands and products.
- Ensuring that your shower is turned off, use a spanner to loosen off the shower rose. Remove the shower rose. Your new Methven shower rose should simply screw onto this fitting. Ensure that there is a washer in place to prevent any leakage.
- Note: this only applies if you are removing a shower head from an arm. It does not apply when removing an arm. In this case threads need to be sealed.
- For more information, please contact your local Methven stockist, or contact us directly.
- Ensuring that your shower is off, twist off your shower handset. If this is tight, which may have happened due to a calcium build-up, you may require a spanner for this. Remove the handset. A new Methven Shower should simply screw onto this fitting. Please ensure that there is a washer in place to prevent any leakage.
- For more information, please contact your local Methven Stockist, or contact us directly.
Check that the faceplate is not cracked. If it is, you’ll need to order either a new faceplate, if one is available (currently available on Methven Satinjet, Futura or Genesis showers) or a new showerhead or handset. The cracking could be due to the pressure of your shower being too high. In this case a flow restrictor will need be installed to prevent it happening again.
- Check if the fitting is threading correctly, and not cross-threaded. A washer may need to be fitted. If the fitting has been cross-threaded, a new showerhead may be needed. Note: you should not use thread tape when fitting Methven showerheads to shower arms.
- Your hose or hose fittings may be damaged (if you have a slide shower). In this case you will need a new hose.
Methven tapware is designed and manufactured for enduring style. To maintain the quality finish, please follow these guidelines:
- Choose only gentle cleaning products and don’t use harsh abrasives.
- Wipe with a soft cloth and water. If necessary, use mild dishwashing liquid or liquid soaps.
- To remove stubborn stains or marks, look for a reliable brand of specialist metal cleaner (e.g. a gold cleaner for gold finishes).
After a period of time, the nozzles can become blocked with lime or calcium build-up from hard water, which distorts the spray pattern. In this case, simply soak it in equal parts vinegar and hot water. This should dissolve the mineral deposits. Avoid caustic cleaners.
Tips and Advice for Professionals
Fastflow Tips & Tricks
- Check that the water pressure is below 500kPa at all times. If not, install Pressure Limiting Valve and Cold Water Expansion Valve. (The cartridge seal may have been displaced by high pressure). Clean and check cartridge seal, re-fit or replace cartridge.
- Do not plug the outlet when hydrostatically pressure testing a new installation, as this may damage the ceramic cartridge.
- Are line strainers installed on both hot and cold supplies? If not, fit line strainers and new cartridge. The cartridge may have been damaged by grit or debris.
- Are line strainers installed on hot and cold supplies? If not, fit line strainers and new cartridge. Ceramic cartridge may be damaged by grit or debris.
- Check pressure is below 500kPa at all times. If not, install Pressure Limiting Valve and/or Cold Water Expansion Valve. Clean & check cartridge seal or replace cartridge. Cartridge seal has been displaced by high pressure.
- Is the handle near the 8 o’clock position during 40°C shower? This is not necessarily a true gage of temperature. In areas like Invercargill, you may need a different position, due to water temperature. Check for partially blocked hose. Whilst running water, remove hose and re-check temperature at elbow. If temperature rises, change hose or hand-piece. Also check if any flow restrictors are fitted – not suitable for unequal pressure installations
- Is hot water temperature at rose greater than 55°C ? If not, turn up cylinder or TLV to 55°C or more.
- Are hot and cold flow rates approximately equal? If not, check correct jet is installed. Is handle near 4 o’clock position during 40°C shower? Again, these positions don’t necessarily work for all installations. Try moving the handle closer towards cold. With insufficient cold pressure, replace red jet with blue jet to balance flow, or remove blue jet to balance flow. Also check for debris on the jet. This is evident when the customer reports a sudden handle position change. Remove Jet and clean.
Remove hose from elbow whilst running and check for rise in water temperature. Change hose around (end for end), or replace hose. Water is passing around inner hose, restricting flow, reversing the flow of water through the hose normally solves the problem.
- Minimum equal pressure = 35kPa
- If supply exceeds 500kPa a pressure limiting valve must be installed
Hot minimum = 35kPa
Cold = 300 – 400kPa use blue jet to increase cold flow
Cold = 400 – 1000kPa use red jet to restrict cold flow
Cold = 5 - 20°C
Hot = 55 - 80°C
Un-equal pressure requires 450mm of straight pipe after the mixer for, without any flow restrictions, i.e. narrow elbows.
- Check that the barrel or cartridge is not loose. Can the barrel be tightened clockwise by hand without stiffening the spout?
- Check pressure is below 1000kPa at all times. If not, install Pressure Limiting Valve or Cold Water Expansion valve. Clean and check cartridge seal or replace cartridge.
- Are line strainers installed on hot and cold supplies? If not, fit line strainers and new cartridge.
- Is valve inlet temperature above 65°C? If not, check water heater temperature.
- Are line strainers installed on hot and cold supplies? If not, fit line strainers.
- Clean & check valve member. If valve is dated after February '95, the kit #782004 is available.
Valve is sticking. Clean & lubricate the valve member, or if the valve is dated after Feb.'95, replace valve member with #782004 kit.
Minimum equal pressure = 35kPa
Maximum pressure = 1000kPa
Flowrate at 35kPa = 20l/m – this is 35kPa at the valve – we recommend valves are installed as low as possible on 35kPa installations
Cold = 5 - 20°C
Hot = 65 - 80°C