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Ariëtte & Marc Lamberts | CEO House of Duratech

FAQ – Frequently Asked questions

On this page you can find some of the most frequently asked questions. Use the categories or the search bar below to make your quest even easier.

There is probably nothing wrong. These outputs do not supply a voltage, they are called dry contacts. You can compare them with a single pole switch.

There are some possible things that you can check:
▪ is there enough water flowing through the heat pump:
✓ by-pass settings OK?
✓ sand filter backwashed?
✓ is air flowing through together with the water?
▪ maybe the flow sensor is broken


At certain times the heat pump starts a defrosting cycle to get rid of the ice on the evaporator. The evaporator is warmed up by reversing the operation cycle of the heat pump. Hot refrigerant is sent through the evaporator to melt the ice that becomes vapour occasionally.

There are several possibilities:
▪ in normal operation the ambient air is cooled down by several degrees, sometimes below 0°C and humidity will become ice on the evaporator
▪ there is a gas leak in the system but not big enough yet to trigger the alarm
▪ the fan is not spinning due to some problem
▪ the air flow through the heat pump is (partially) blocked

A heat pump does not operate in the same way as a central heating system. It takes between 4 – 6 hours to increase the pool water by 1°C under ideal conditions, meaning without losses and with a heat pump selected according the size of the swimming pool. So, you need several days heating 24/24 to reach the desired temperature. Once the water is warm it takes just a few hours a day to keep it at that temperature.

This is to prevent having difficulties when you need to remove the heat pump from the installation.

Because it has less internal losses and reacts better to the fast power switching inside the lights.

It is much better to use a dedicated cable from the transformer to every light. That will allow for smaller cable section to be used and so saving money.

It tells us when the items were made and which components were used to make it. It is also very important to have this information when a technician is sent out for a repair on site.

Almost every material that conducts electrical current has some resistance that limits the current. This resistance depends on the length of the conductor. The resistance generates a voltage drop over the conductor/cable that increases when the current and/or the length increases. The item at the end of the conductor receives less power than what the power supply delivers. That item can become faulty or can get damaged when this voltage drop becomes too large. This power drop can sometimes be felt when the cable is getting warmer.

Because of the power that was lost in the cable.