Top tips for heat pumps
by Anonymous Author
Heat pumps are very popular but it’s important to choose an efficient model and use it properly, according to EECA Energywise.
EECA Technical Expert Christian Hoerning says heat pumps can be very economic if used correctly, they are convenient and produce instant heat.
Types of heat pump
Single-split systems are the most common heat pumps in New Zealand — they are air-to-air, with one indoor unit connected to an outdoor unit. These systems are designed to heat just the room that they are installed in, not the whole house.
Multi-split heat pumps are designed to heat multiple rooms — and consist of one outdoor unit serving multiple indoor units installed in different rooms of the house.
Ducted heat pumps provide central heating — by blowing heated air through ducts into multiple rooms of a house.
While some can only be controlled centrally, others allow you to choose which rooms or groups of rooms you want to be heated at any given time (zoning).
For example, you may only want to have your bedrooms heated overnight.
Choosing an efficient model
All heat pumps have an Energy Rating Label that helps you compare the efficiency of similar sized models.
The more stars, the more energy efficient a unit is — red stars are for heating efficiency and blue stars are for cooling.
A heat pump label has two numbers that can tell you more about the heat pump’s performance:
1. Capacity output — the amount of heating or cooling (kW) you will get out of the heat pump (at its rated capacity, at 7˚C outdoors)
2. Power input — the amount of power the heat pump uses (kW) to produce the cool or hot air.
Some heat pumps struggle to perform when it’s just above freezing point outside.
Ask your supplier for a heat pump that will perform well in your region.
A good quality unit — sized and installed correctly — should perform effectively down to minus 15°C.