The effect of water source on energy efficiency of washing machines


The NVWA (Nederlandse Voedsel en Warenautoriteit - Dutch authority on food and goods) released an interesting report on energy labels of appliances - they found that 20% of energy labels were incorrect, claiming the appliance were more efficient than it actually was. Did you know our Waste Checker measures appliance data across 210,000 users, showing us that 50% of appliances are inefficient(ly used)? Waste Checker doesn’t stop there - but gives users personalised tips to improve on their efficiency.

Moreover, we found that appliance efficiency is very dependent on external factors, like seasons or water sources. Since it’s World Water Day today, let’s have a closer look:

Based on 75 million washing machine cycles, we found that washing machines with surface water take an average of 2 minutes longer to heat up in the winter than those with groundwater.

60% of Dutch citizens use surface water. This can reach a temperature of 7 degrees in winter - instead of groundwater, which is about 17 degrees all year. So appliances can take more time and energy to heat surface water than groundwater.

Manufacturers certify the efficiency of their machines according to a starting water temperature of around 15 degrees, which differs from the 7 degrees that surface water can be in winter. So you could be in the situation where you buy a brand new washing machine, use it on the 30 degree or eco program, and find it is still less efficient than you expected.

Did you know Quby also has a new feature for measuring water usage? Our partner ENGIE electrabel provides their customers water insights as part of their new UP campaign.

Find more insights and data services here.

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