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Alternative heating underfloor


The RHO-HAMMER™ has been developed to flush out corrosion and sludge that can build up in heating systems.

Over time, corrosion and sludge can build up in heating systems and this often accumulates within the radiators creating cold spots within the radiators. These deposits lead to efficiency loss thus need to be flushed out. To speed up the chemical flushing process and improve the cleansing efficiency it is recommended to vibrate the radiator surface to loosen the deposits within.

The RHO-HAMMER™ has been developed for that purpose. Designed to fit into a standard SDS chuck, the RHO-HAMMER™ has a replaceable flat-faced head.

Operating Instructions

  1. During power flushing, monitor each radiator for cold spots, noting their locations using an infra-red thermometer.
  2. Attach the RHO-HAMMER™ to your SDS drill, and set the drill to “hammer only” mode (non-rotational).
  3. Clean any debris or dirt from the face of the RHO-HAMMER™ and the surface of the radiator.
  4. Hold the drill so that the face of the RHO-HAMMER™ is perpendicular to the surface of interest of the radiator.
  5. Turn on the drill for 3 seconds whilst holding the RHO-HAMMER™ against the radiator, applying moderate pressure.
  6. Check the radiator temperature and repeat the operation in other stubborn areas, if required.

Operation Notes

  1. Only use the RHO-HAMMER™ on an individual radiator that is receiving the full flow of the Clearflow pump, to ensure that loosened debris is carried away.
  2. Do not use excessive force. The more pressure applied to the SDS drill, the more powerful the vibrational force on the radiator will be, and you may damage the paint surface. Apply pressure in accordance with your assessment of the overall condition of the radiator.
  3. The RHO-HAMMER™ is not intended for either continuous use, or for use over the whole radiator area. Excessive use could result in damage to either the radiator or the RHO-HAMMER™ head.
  4. The RHO-HAMMER™ is an impact instrument and the replaceable head will wear with time. The life of the head will be considerably reduced if the RHO-HAMMER™ is applied to radiators at an angle.


  • Always refer to the SDS drill manufacturers’ safety instructions before use, and wear ear defenders.
  • Never use the RHO-HAMMER™ on any radiator that is connected to anything other than standard copper pipework.
  • The vibration and removal of stubborn deposits may uncover hidden corrosion that is already present within the heating system leading to potential leaks.
  • Loose paint may be damaged or removed. Always indemnify yourself from damage the use of the product may cause.

Replacement heads are available from Rhomar Water (part number MI040B).

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