|Our water cooler provides|
hot and cold water
I was at work the other day making some tea with our water cooler and hot water was flowing as usually ... when I realised the input tap was shut. I found this is strange that water coolers strore hot or room temperature water since it can cause health hazards.
Since I'm working on this energy consumption project where we find back individual appliance electrical consumption from a unique point of measure and we already noticed the water cooler was consuming lots of energy (more than a fridge!). I decided to open it to verify if there was something like a room temperature or hot water tank inside.
Here is what I discovered: the cooler heats water it just refrigerated
Tap water comes in through a unique pipe and fills a unique refrigerated tank.
|The water mains pipe filling|
a unique refrigerated tank
This tank is fitted with two holes: one goes to the cold water (blue) button while the other one goes through an electrical heater before going to the hot (red) tap.
|Inside the refrigerated water tank|
there is a plastic separator between
the tank top and lower parts
|Center hole: through the heater|
Right hole: to the cold tap
Finding this highly inefficient, I contacted the manufacturer to understand the rationale behind this apparently inefficient approach. Their answer was in short: 'we heat refrigerated water to reduce sanitary hazards caused by hot or room temperature water storage'.Even if this could have somehow made sense, it is highly inefficient and greatly increases electrical consumption. They could have simply gotten warmer water from directly from the tap instead of using chilled water without storing it.