Tips & Advice for Owning & Maintaining your Heat Pump

These tips can help to prevent problems occurring with your heat pump and prevent possible damage to the unit and also reduce your running costs to the minimum.

  1. Avoid placing items such as bins, plants, dog kennels, water tanks etc, or parking of vehicles within 1-meter either side of the outdoor heat pump and 1.5 meters in front of the heat pump unit, as this will disturb airflow and result in the heat pump working harder causing higher electric bills.
  2. Do not place screens or fences, hedging, shrubs, or plants around the heat pump as this will reduce the airflow which will increase the running costs.
  3. Keep the heat pump clear of leaves and debris under and behind the outdoor unit. Leaves can be drawn in by the fan and block the airflow through the coil fins causing restricted airflow and can also cause blockage of the water drain on the bottom tray.
  4. Do not power wash the outdoor unit as power washers cause expensive damage to the coil fins reducing its efficiency and increasing running costs.
  5. During domestic hot water heating (DHW), the heat pump stops heating the radiators and the under-floor heating until the domestic hot water reaches its target temperature as set on your controller. When the DHW target temperature is reached plus 2 degrees it will then return back to heating your radiators and underfloor heating (Priority goes to heating the DHW). This is why your radiators may feel colder when the room stat is calling for heat.
  6. Avoid using the timer function heating the rooms (unless you have reduced night rates), heat pumps are most efficient on constant rather than timer mode.
  7. Avoid placing cover screening panels on your radiators as they restrict heat emitting from the radiators causing the heat pump to run longer to reach the room target temperature.
  8. Avoid placing items such as coat hangers close to the heat pump isolation switch in the hot press, as there is a possibility of inadvertently knocking off the isolation switch, which can occur when hanging coats etc. this will result in the heat pump shutting down, and you may not be aware of this for several hours or days later.
  9. Avoid open windows and doors as heat losses will occur causing in the room temperature to drop causing the heat pump to run excessively to maintain target temperature called by the room stats.
  10. Reduce (DHW) domestic hot water temperatures to the minimum temperature which will minimize running costs.  A typical temperature found on a lot of heat pumps is 48 degrees, every degree below this will reduce your energy costs.
  11. Ensure your heat pump is serviced once every year as this service is part of a preventive maintenance program and a requirement to keep your heat pump warranty valid and reduces the possibility of a heat pump shutdown.
  12. Apart from the DHW temperature, avoid changing any of the other settings that were set during the commissioning of the heat pump.



Heat pumps are controlled by the end user through the room stats. The room stats are basically a switch for turning on and off your heat pump system.

Comfort levels are increased or decreased by the room stat by increasing or decreasing the temperature by the up arrow or the down arrow or by a rotary dial in some cases.

After increasing the required room temperature, a flame should appear on the stat screen which sends a run signal to your heat pump provided the required temperature is above the current room temperature.

When the room stat reaches the set temperature, the stat flame on the screen will disappear and the run signal to the heat pump will distinguish and the heat pump stops running. When the room drops below approximately 1 to 2 degrees below the pre-set temperature, the stat will re-call for the heat pump to run until that pre-set target temperature is reached maintaining the room to your set comfort level.

For a 2 or 3 story house a stat for each floor level works best with heat pumps, as heat pumps don’t run economically with constant start and stop cycles. Room stats in every room can lead to excessive heat pump start cycles causing higher running costs. If you have stats fitted in all rooms, setting them to the same temperature will reduce excessive heat pump start stop cycles which keep your running costs down. With exception to bungalows where bedroom stats may be needed for lower temperatures for comfort levels.

Heat pumps should be left on all the year including Summer and Holidays. Reduced temperatures on the room stats for the summer will keep the heat pump in standby for the heat emitters and the pump will only operate for the heating of the hot water.

If you are going on holiday during the winter, room temperatures may be reduced by 1 to 2 degrees which will prevent the house cold soaking which will lead to costly electricity bills on your return when bringing back up the temperature in your house to your comfort levels. Using this method there is no need to use the holiday mode option on your remote controller.

Room stats showing a pad lock symbol on the screen indicates that the screen is locked, and no temperate adjustments are allowable. In most cases by pressing and holding both the up and down arrows at the same time for 5 seconds will disable the lock allowing temperature change.

The location of the room stats is important for accurate room temperatures, preferably not in direct sunlight or close to exterior doors which can cause an inaccurate temperature reading and can result in inaccurate room temperatures.


Water Operating Temperatures

Domestic hot water (DHW) is recommended to be set at 41 degrees and flow temperatures for radiators at 40 degrees, under floor heating flow temperature can be set lower to 35 degrees due to UFH is more efficient than radiators.

It is good practice to lower your domestic hot water to 41 degrees, scalding can occur at 45 degrees, decreasing to 41 degrees can prevent the possibility of accidental scalding and will also reduce your electricity bill.


Heat Pump Warranty

Your Heat Pump requires a service every year to keep your warranty valid under the Manufacturer / Distributer warranty terms and conditions.

An annual service also keeps your Heat Pump running most efficiently saving you on your electricity bill and reduces wear and tear on your Heat Pump system.

Only an approved service Engineer trained by the Heat Pump Manufacturer / Distributor is acceptable to service your Heat Pump under your warranty terms and conditions.

Servicing it yourself or having it serviced by someone who is not trained and approved by the Manufacturer / Distributer will void your warranty.

Keeping your warranty valid is of the upmost importance to you, as it will minimise expensive repairs plus costly call out fees, and less worries to you in the event of a Heat Pump failure.

A warranty call receives a faster response call out time and it saves you the time and stress of looking for an Engineer to repair your Heat Pump in the depth of winter when you mostly need your heating system working, bearing in mind that Heat Pump Engineers are not always available for breakdown call outs at short notice.

Warranty time varies with Heat Pump Manufactures, some last up to 10 years. Your Heat Pump is registered for its warranty at the time of commissioning and your annual service records keep your warranty valid.


The Outdoor Unit Drainage Tube Cleaning

One important item that is sometimes overlooked, is the inspection and cleaning of the outdoor unit drain tube. It is vital that it is kept clean and free of leaves and sludge build-up to allow the free flow of the condensate water from the base tray. When the drain tube is blocked it will cause water accumulation on the bottom of the base tray which will lead to the onslaught of corrosion resulting in the base tray decaying and losing its integrity. Some of the components such as the Compressor are mounted on the base tray. Heavy corrosion in this area can cause the compressor to shift and lead to extensive damage to the outdoor unit over time. Part of the annual service is to inspect and clean the drain to ensure that this drain is tube is unrestricted.