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Wilo high-efficiency glandless circulating pumps.

Glandless circulating pumps

Wilo high-efficiency pumps already meet EU demands that total electricity consumption of all glandless circulating pumps operated for heating and air conditioning to be halved by 2020.

This is the objective of an EU ordinance under the European ErP (Eco-Design) Directive which will regulate the energy efficiency of this type of pump, from 1 January 2013 onwards, with a further tightening of requirements planned for 1 August 2015.

Overall, these changes are thought to be likely to provide an energy saving of 23 terawatt hours for the EU as a whole.

This corresponds to the electricity generated by about six medium-sized coal-fired power stations, or a reduction in EU-wide carbon dioxide (CO2) emissions of about 11 million tonnes per year.

That’s a hefty reduction by any standards.

In order to achieve this goal set by the European Commission, the EU ordinance prohibits the sale of technically outmoded, inefficient pump models from 2013 onwards.

This will mean a ban on sales of about 90% of the glandless circulating pumps that were on the market in 2009.

The reality is that the new efficiency requirements will be practically impossible to achieve without using high-efficiency pumps with EC motor technology.

The important new yardstick for determining which pump models can continue to be used in future is referred to as the energy efficiency index (EEI).

This is calculated using a process defined in the ordinance (EC) 641/2009.

The average electrical power of a pump is calculated on the basis of a load profile in relation to a reference pump, i.e.

an average pump with the same hydraulic output.

From January 2013, the limit EEI value of glandless circulating pumps installed outside the heat generator - external pumps - not those incorporated in combi or system boilers at this stage - will be defined as 0.27.

The energy efficiency classes specified at present will then become superfluous, because as a rule, pumps will be better than the minimum requirements of the current class A.

From August 2015, the EEI limit value will be reduced to 0.23.

This will also apply to glandless circulation pumps, designed to operate in newly installed heat generators or solar thermal systems (integrated pumps).

In the last implementation stage, the regulations starting from 2020 will also apply to the replacement of integrated pumps in existing heat generators.

The regulations apply to all glandless circulating pumps in heating and air conditioning applications with the exception of drinking water circulation pumps.

Looking at the current pump population, there are still many heating and air conditioning systems which are equipped with pumps that have no speed control.

Because of this, an unnecessarily high amount of electricity is consumed - up to ten times more than the newest pump generation requires.

Models with extremely low electricity consumption are already available including many from Wilo.

These not only benefit the environment but also clearly, offer significant benefits to the building owner and the consumer because of lower electricity bills, whilst making no concessions in terms of comfort and performance.

So it’s no surprise that pump manufacturers with the technology to offer high efficiency pumps, such as Wilo, are recommending that specifiers and installers exclusively use high-efficiency pumps in their planning and their offers.

The ’Wilo-Stratos’ and ’Wilo-Stratos PICO’ series of single pumps offer potential electricity savings of up to 90% compared to standard pumps without speed control.

They already comply with the limit values of the second stage of the glandless circulating pump ordinance due for 2015, and are already prepared for the future, without any restrictions.

The electronically controlled glandless circulation pumps with maintenance-free frequency converters automatically adjust their power to the changing operating status of the heating system.

Especially in the partial load range, which makes up as much as 94 per cent of the operating time of a heating pump, a considerable reduction in power consumption can be achieved compared to an uncontrolled pump.

In addition, they have what are known as electronically commutated motors (ECMs).

These make it possible to double the efficiency compared to electronically controlled pumps with conventional drives.

A change to high-efficiency pumps before 2013 will of course make a contribution to energy efficiency in heating systems, to energy costs in properties, and contribute towards climate protection in Europe.

It’s a fact that the electricity saving potential of up to 90 per cent offered by these pumps compared to pumps without speed control makes them so attractive to some customers that they are already swapping them for their ’old energy guzzlers’ in advance of the deadline, which is good for everyone.


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