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Rotorua, Bay of Plenty

Heat pumps in RotoruaSized for the frost, protected from the sulphur.

An installer for Rotorua

Registration-checked installers in Rotorua who specialise in your kind of job see it, and the one who takes it gets in touch to quote.

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A Rotorua heat pump has two jobs most towns don't ask of it at once: heating through a long, frosty winter, and surviving geothermal air. NIWA gives Rotorua Aero AWS 2,033 heating degree-days a year, against 1,324 at coastal Tauranga, and BRANZ found copper the metal most at risk from the sulphur. Plan for both before you choose a unit.

Rotorua's climate and air

Frosty winters

Rotorua Airport averages 19.9 air frosts and 57.3 ground frosts a year, with 7.3 air frosts and 14.0 ground frosts in July alone (NIWA). Wikipedia's table of the 1991 to 2020 normals gives a July mean daily minimum of 3.7 degrees.

Climate zone and summers

MBIE's H1/AS1 places Rotorua District in climate zone 4. February's mean daily maximum is 23.1 degrees, but cooling demand is light: 58 cooling degree-days a year.

Geothermal corrosion

BRANZ found copper samples near Sulphur Bay lost 443 to 495 g/m2 in a year, with heavy corrosion even where hydrogen sulphide levels were low. It says the area 200 to 400 m south or southwest of Sulphur Bay could be classed as extreme (CX) corrosivity.

The airshed

The Rotorua Airshed was established in 2005, and Bay of Plenty Regional Council says numerous breaches of the national PM10 standards were recorded at the Edmond Road monitor. The Rotorua Air Quality Control Bylaw bans indoor open fires and restricts new burner installations.

Damp and heating

23.9% of people in the Lakes health district, which covers Rotorua, lived in damp homes in 2023 (EHINZ). 59.59% of Rotorua District homes used a heat pump as a main heater at the 2023 Census.

Protecting the outdoor unit from geothermal air

Consumer NZ describes a split heat pump's two units as joined by copper refrigerant pipes, and copper is the metal BRANZ found most vulnerable in Rotorua. BRANZ's installation guidance says outdoor units in geothermal areas need extra anti-corrosive coatings, and that corrosion-resistant coils are especially useful where sulphur levels are high.

Miss it and the warranty may not help. Haier's warranty booklet excludes geothermal sulphur contamination. Rinnai NZ makes the owner responsible for extra protection where sulphur content is high. MHIAA, the distributor for Mitsubishi Heavy Industries, excludes damage in sulphur areas, and Black Diamond Technologies, Mitsubishi Electric's warranty company, says units in geothermal settings must be assessed and protected before installation. Ask for the protection to be named on the quote.

Selling a house with an old burner

Wood burners installed before 1 September 2005, all coal and multi-fuel burners, and indoor open fires are non-compliant in the Rotorua Airshed. Under the bylaw, the vendor has to remove them or replace them with compliant heating before the sale completes.

If a heat pump is your replacement, get it organised early so the heating isn't what holds up settlement, and confirm with Bay of Plenty Regional Council that your plan meets the bylaw. If you'd rather keep a burner, any new wood burner must meet a maximum emission rate of 0.60 g/kg and at least 65% thermal efficiency.

The jobs that come up most in Rotorua

Heat pumps sized for frost. EECA says to check the label's 2 degree heating figure wherever nights get that cold, and with 19.9 air frosts a year they often do here. BRANZ adds that an undersized heat pump runs continuously and defrosts regularly. Our sizing guide walks through it.

Burner replacements. Whether it's for a sale or simply to be done with the smoke, a heat pump installation specialist can quote the unit and its corrosion protection together.

Servicing in geothermal air. Mitsubishi Electric NZ says geothermal systems may need servicing more often than standard ones. Our Rotorua servicing page covers what that visit should include.

What we'd do

Where we'd start

We'd treat corrosion protection as part of the heat pump, not an extra: named on the quote and matched to the brand's warranty terms. We'd size the unit on its 2 degree figure for a Rotorua July. And if we were selling with an old burner in the lounge, we'd get the replacement quoted well before listing, so the heating isn't a last-minute scramble.

Heat pump and heating jobs in Rotorua

Questions people ask

Do heat pumps last in Rotorua's geothermal air?
They can, but they need help. BRANZ's research shows how hard the sulphur is on copper, so a unit with corrosion-resistant coils and extra coatings, serviced more often, has the best chance. We don't have a reliable lifespan figure for Rotorua, and we'd be wary of anyone quoting one.
Can I replace my wood burner with a heat pump before selling in Rotorua?
Yes, and under the bylaw a non-compliant burner has to be removed or replaced with compliant heating before the sale completes. Check with Bay of Plenty Regional Council that your replacement plan meets the bylaw before you book the work.
Do I need a building consent for a heat pump in Rotorua?
Not for a pipe hole up to 300 millimetres through an existing house, which Schedule 1 of the Building Act 2004 exempts. The Building Code and the district plan's noise rules still apply. A new wood burner is different: Tenancy Services says wood and pellet burners need a building consent to install.
Is a heat pump enough to heat a Rotorua home?
For the rooms it's sized for, if it's sized for frost. One high-wall unit won't warm the whole house, so look at a multi-room heat pump or ducted heat pump for the bedrooms. BRANZ is clear that heat pumps don't replace good insulation.
How do I find a heat pump installer in Rotorua?
Tell us the job and your postcode. Local installers who specialise in it, and whose registrations we've checked, can see it, and only the one who takes it gets your details. If nobody near you does that kind of work yet, we'll tell you.

Ready for the right installer to take a look in Rotorua?

Your postcode and three quick questions. Registration-checked local installers who specialise in your kind of job see it, and the one who takes it gets in touch to quote.

Free for you. Installers pay us for each job we pass on.

Read next

  1. 01Heat pump servicing in RotoruaServicing a heat pump in geothermal Rotorua: how often, and what to check for corrosion.
  2. 02What size heat pump do I need?How to work out the kW for a room, and why the 2 degree figure on the label matters.
  3. 03Heat pumps compared with other heatingHow a heat pump stacks up against a wood burner, gas, electric heaters and central heating.
  4. 04Heat pump brandsWho issues each brand's NZ warranty, what it asks of you, and what to compare.
  5. 05Home ventilation systemsWhat a home ventilation system does, the two main types, and how to tell which one suits your house.
  6. 06Heat pump installers in Bay of PlentyTauranga's coast and Rotorua's geothermal air ask different things of a heat pump. Here's how.

Where this information comes from

We don't publish prices. Every home is different, so an installer's written quote is the only real number. How we write and check these pages.

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