As our homes get bigger, one of the biggest issues is delivering hot water quickly and efficiently to our hot water taps. Longer pipe runs means the hot water cools. When the outlet is turned on, then all that cold water has to dissipate before the hot water arrives.
We know Mixergy hot water cylinders can heat water faster than your traditional cylinder. But did you know that the configuration of the pipe set up in the home also has an impact on how quickly and efficiently the hot water gets to the taps?
To ensure hot water is delivered quickly, most people will locate their hot water cylinder centrally within the home, between the hot water outlets, which reduces the required pipe lengths.
However, when this is not possible, you can also set up a hot water return circulation loop from the cylinder itself. This can significantly reduce the time it takes for hot water to get to the taps.
It should also be noted, that although not a legal requirement, the HSE recommends hot water should be delivered at 50ºC within 1 minute to help combat legionnaires disease.
So let’s take a look at how Mixergy is the ideal cylinder solution in a hot water secondary return system.
The idea is you have your primary hot water pipe flowing through the house. Next to this, you’d then have a “secondary recirculation pipe”, which travels beside the hot water primary pipe to the extremities of the system.
The secondary pipe taps into the primary to join the two pipes together. The cylinder then has a hot water circulation pump. The pump is set to push the water through the primary pipe to the tap, and it then returns via the secondary pipe, keeping your hot water hot all the way to the tap.
Historically the hot water secondary return pipework configuration would be similar to the system schematic below where it would enter via the bottom of the cylinder. But this can be very energy intensive as the whole hot water contents in the cylinder need to circulate around the system. This loses heat, which in turn makes the heat source turn on to reheat.
In more recent years the hot water secondary return connection has been within the top section of the cylinder, which reduces the full contents being circulated and reduces the energy usage.
As well as this, Wilo has introduced a programmable bronze pump. You can set the times that the pump is active, to avoid constant circulation, making it even more efficient than a standard pump, resulting in less heat loss.
If you’re setting up a hot water secondary return system, you also need to consider the following:
Mixergy cylinders of 210 litres and above in size have a secondary return connection available. Everything you need to consider with a secondary return for a traditional cylinder, also apply with a Mixergy cylinder.
As Mixergy cylinders have a setting that can maintain the target temperature, we don’t need to reheat at a 5ºC temperature drop. This saves energy and is far more efficient than a traditional cylinder.
Hot water secondary return is a great solution for delivering efficient hot water in larger homes.
Alongside all our other smart control benefits and allowing the home to only heat what they need, Mixergy cylinders are the ideal cylinder solution to coincide.
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