Discussions on the wisdom of installing hot water circulation systems in residential and public buildings can be found on many forums devoted to hydraulic installations. Every owner of a house being built or modernized should estimate the costs of installing and maintaining a circulation system that would have to be incurred for the comfort of using hot water without waiting for it. These estimated calculations should make it easier for you to make an individual decision. However, in most single- and multi-family houses currently being built, hot water circulation installations are already standard.
In order to reduce heat losses during periods of no hot water consumption and to save electricity to power the circulation pump , pump manufacturers offer many solutions that involve starting the pump only when it is necessary to ensure that the water in the tap is warm enough immediately after it is turned on.
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Grundfos offers several solutions to meet this requirement, including a circulation pump that recognizes users' hot water usage habits (COMFORT AUTO Adapt ) and turns on just before the expected periods of use. However, many users would like to decide on the circulation forcing periods themselves, and the COMFORT pump with an integrated digital clock is addressed to them.
In the full name of the Grundfos BDT PM circulation pump, the acronym PM means that the pump is equipped with a high-efficiency permanent magnet motor. Thanks to this, the pump operates extremely quietly, the noise level (sound pressure) is less than 43 dB(A), and the power consumption ranges from 5-7 W. The 12-pole 1-phase motor complies with the electromagnetic compatibility directive ( EMC), which means that the pump operation will not interfere with the operation of other devices in the apartment.
The internal short-circuit protection of the pump is important for the installer
and its double electrical insulation, which allows electrical connection without a protective earthing conductor. The pump is powered by a single-phase electrical network via a 1.5-meter cable with a standard Schuko plug.
In turn, what is important for the user is the built-in protection of the pump against dry running and, above all, easy operation, which comes down to setting the digital clock on the transparent control panel. The standard equipment includes thermal insulation linings to prevent heat loss from the pump.
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Technical data of the Grundfos BDT PM circulation pump:
- Maximum pressure in the installation 10 bar
- Maximum efficiency 0.7 m 3 / hour.
- Maximum lifting height 1.2 m
- Maximum sound level 43 db(A)
- Power consumption 5-7 W
- Liquid temperature range 2 – 95 °C
- Ambient temperature range 0 – 40 °C
Grundfos circulation pumps
Main features and benefits of the Grundfos circulation pump:
Possibility of programming work according to user requirements- Easy to use – a simple way to change settings
- Low heat losses – thermal insulation cladding
- Corrosion resistance - brass body
- Easy installation - small installation space required, 1.5 m electric cable permanently connected to the pump, easy disassembly of the head
Grundfos offers two versions of the COMFORT DT circulation pump : with non-return valves
and shut-off valve in the pump stubs (BXDT marking) or a version without these valves (BDT). The installation length of the BXDT version is 140 mm and the BDT version is 80 mm.
After just a few months of existence on the market, the COMFORT BDT PM pump won the title of "Product of the Year 2021" in the Plus X Award competition in five categories: High Quality, Design, Convenience of Operation, Functionality and Ecology. The Plus X Award is recognized around the world and has been awarded for 18 years.
COMFORT PM pumps, including the version with a digital clock, meet all hygiene requirements, confirmed by the National Institute of Hygiene (PZH) certificate for drinking water, and provide the user with hot water without waiting when it is needed - on time.
Author of the text: Dr. Eng. Zbigniew Waśkiewicz, Grundfos Pompy Sp. z o. o
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