The Sanden Eco Plus heat pump hot water (HPHW) system will operate effectively between - 10 º C and + 43 ° C, without the need for an electric booster element. It is also fitted with built in freeze protection, making it suitable for all climates.

Yes, you can use a Fronius Datamanager 2.0 box and connect the Fronius Smart Meter to it. This can then be added as a PV system in Fronius Solar.web to visualise the consumption values.

The Sanden Eco Plus heat pump hot water (HPHW) system is designed to last for 15 years. The high quality, weather resistant Eco® Plus HWHP outdoor module carries a 6 year warranty and the extra-long life stainless steel storage tank carries a class leading, 15 year warranty.

To answer this we need a little bit of background. To protect your Sanden unit from excessive pressure there are three valves:

Valve 1. The pressure reduction valve (PRV) which is located on the water inlet to your home and is set to 500kPa. This valve is designed to keep the pressure out of any tap in your house below 500 kPa.

FAQ - The cold water valve (or ECV) on my Sanden is leaking a lot what is causing this


Valve 2.  The expansion control valve (ECV) which is located on the cold water inlet to your Sanden and is set to 600 kPa. This valve is designed to relieve cold water instead of hot water during the heating cycle (which increases pressure in the tank) which saves you money and protects the final valve, the PTR.

FAQ - The cold water valve (or ECV) on my Sanden is leaking a lot what is causing this

Valve 3.  The Pressure and temperature relief valve (PTR) which is located on the hot water outlet to the Sanden and is set to 700 kPa.  This valve is designed to release hot water from your tank if the pressure gets too high or the water heating cut-off fails to work.


FAQ - The cold water valve (or ECV) on my Sanden is leaking a lot what is causing this


One of the main reasons ECV valves leak water excessively (apart from wear and tear or malfunction) is excessive water pressure in the mains supply which is not properly being reduced by a PRV as it enters your house to at or below 500 kPa; in many areas the mains water pressure is 850 kPa + this is to ensure fire fighters have enough pressure to use their fire hoses properly in the event of a fire. 

Note: the Australian standard covering water pressure in the home (AS 3500.1:2018) mandates that water pressure in your home must be kept below 500 kPa as water pressure above 500 kPa  has the potential to damage valves, tap fittings, flexible hose fitting etc as the components are only rated to withstand pressures at or below 500 kPa. 

So if you notice that the expansion control valve (valve 2 discussed earlier) on your Sanden is leaking excessively chances are you have excessive water pressure at your house and your PRV (valve 1) is either not present or not working.

Either way you should get a plumber to check the water pressure in your house and make sure you have a functional PRV.  You can also buy a cheap pressure meter from a hardware shop if you want to check your household water pressure yourself:  Note your mains pressure is not constant it will change based on a number of factors including local water use, time of day, time of year or changes in your local area such as new housing being built etc.

For your solar PV monitoring - Fronius - you can utilise the "Night Mode" setting if you would like to observe your load data when the solar PV system is turned off overnight.

Go to the Fronius inverter and do the following:

+ Step 1: Push the Left/Right button until you see "SETUP" (the symbol looks like a spanner cross with a screwdriver) and press ENTER (physical button furthest to the right)

+ Step 2: Scroll down until you see, "Display Settings", press ENTER

+ Step 3: Scroll once down again to, "Night Mode", press ENTER

+ Step 4: Click the + or - buttons to switch the "Night Mode" setup parameter to "ON", press ENTER

And now you should see your overnight usage will be displayed in your Fronius Solar.web account.

No, unlike other competitor heat pump hot water (HPHW) systems, the Sanden Eco® HPHW system does not require an electric booster element

The Sanden Quick Connection Kit includes the tempering valve, ECV (Expansion Cold Water Valve), elbows, insulation gloves for all the elbows and valves so you have the most efficient set up - you can't buy the insulation gloves separately. Makes the plumbing install much quicker (plumber only needs to source copper + lagging for the copper). Always highly recommended to ensure the Sanden is installed to specifications

Normally a house with upto 2 bedrooms is 15mm and 3+ is 20mm. 

Getting access to block out timer mode

Note:  After installation only 'maintenance mode' should be used for block out changes.  There is another procedure on page 16 of the installation manual related to the block out timer this only applies when the unit is first installed. 

To set the block out timer for your Sanden unit you will need to access the 'clock control unit' (shown below in blue), to do this you will need to remove the four screws at the side of the top cover panel on your outdoor unit (shown below), which has a 10 mm lip around the entire unit, to access.

Once you have access to the clock control unit you can set the block out (BO) timer by following the steps below, this will allow you to set your block out hours.  

1 - Hold down "UP" and "DOWN" together - gets you to "HSE" mode

2 - Press "UP" - gets you to outlet water temp setting mode

3 - Press "UP" - gets you to BO mode

4 - Press "ENTER" - gets you to EDIT BO mode (then enter the hours accordingly).

For more information consult page (17-22) of your Sanden installation manual which can be found here

Setting the hours you want to block out

The block out time functions using four digits first two digits = off, second two digits = on so:

To set the timer to run between 12 midday (AEST) and 6 pm set the blackout timer to 1812, which means off at 6 pm (18 in 24 hr clock terms) and on at 12 pm. 

To set the black out timer to run off-peak you might choose 0722 which means on at 10 pm (in 24 hr notation) and off at 7 am. Ensure that the off-peak tariff supplies a minimum of 5 hours continuous power to the Sanden HPHW.

If in doubt don't hesitate to contact us at and we can guide you through the process 

What are STCs and how many do you get with your Sanden?

The purchase and installation of a Sanden Eco® Plus Hot Water Heat Pump entitles you to Small-scale Technology Certificates (STCs) – formerly known as Renewable Energy Certificates (RECs). For more information: visit and

The Sanden HWHP achieves the highest level of STCs of any hot water heat pump, currently available in Australia, and these are as below:

To find out which zone your postcode is in click here (note this may change so if in doubt contact the clean energy regulator for more information)

The Table below shows how many STCs are available for each Sanden model in each STC Zone 


How much are STCs worth?

STCs can be priced through the Government's STC clearing house or on the open market at places like Green Energy Markets

So say you bought a Sanden GAUS-250FQS and you lived in zone 4 and the current STC price was $35

The total discount you would receive would be: 34 STCs x $35 = $1,190. 

So you would receive a discount of $1,190 off the total price of your Sanden unit (note this is an example only to illustrate how STCs are calculated the actual discount will vary depending on the current STC price).

If export limit needs to be done on this site across all the phases then a three phase smart meter will need to be used. If the DNSP doesn’t require export limitation on each of the individual phases then it’s better to use a three phase smart meter because it will export limit once considering the total consumption across all the phases added together.