What shapes heating in Porirua
Built as a state housing satellite
Late 1940s state planning saw Porirua as a satellite city of Wellington built around state housing, in suburbs such as Tītahi Bay and Elsdon. Cannons Creek was mostly farmland until housing arrived from the 1930s, with big growth in the 1950s.
Public housing being renewed
The Government's November 2019 announcement called older eastern Porirua state homes past their best, to be replaced with warm, dry, modern homes. In the west, Ngāti Toa's Te Āhura Mōwai took on over 900 state homes from 1 July 2020, to be made warmer and drier.
Some homes with no heating at all
In the 2023 Census, 1.34% of Porirua City homes used no heating. 66.1% used a heat pump, 45.88% an electric heater and 21.8% a wood burner.
A city wrapped around a harbour
Porirua almost surrounds Porirua Harbour and the Pāuatahanui Inlet. BRANZ puts homes within 500 m of a harbour, or 100 m of a tidal estuary or sheltered inlet, in exposure zone D for sea-spray salt.
Piped gas and a mild climate zone
Powerco has owned the Hutt Valley and Porirua gas networks since June 2001, and 15.14% of homes used a fixed gas heater in 2023. MBIE's H1/AS1 puts Porirua City in climate zone 3.
If you're a Porirua landlord putting in a heat pump
- Run Tenancy Services' heating assessment tool for the main living room first. Its kW answer is the capacity every quote should meet.
- Check the unit's nominal heating capacity on the label, tested at 7 degrees, not its capacity range.
- The standard has applied to every private rental since 1 July 2025, and to Kāinga Ora and registered community housing providers since 1 July 2024.
- Open fires and unflued gas heaters never count, and in a unit title the body corporate rules come before any outdoor unit on common property.
The other jobs that come up here
Owners swapping old heaters. With so many homes still on plug-in heaters, a single high-wall heat pump in the lounge is the common first step. If you think you might qualify for a Warmer Kiwi Homes grant, that's EECA's programme and EECA's decision, so check with EECA before signing anything.
Outdoor units near the water. Around Tītahi Bay or the inlet, ask how the outdoor unit is protected against salt: BRANZ advises extra anti-corrosive coatings in coastal areas. And if the house stays damp once it's warm, see home ventilation in Wellington.
What we'd do
Where we'd start in Porirua
For a rental, we'd run the heating assessment tool before calling anyone, so every quote is measured against the same kW figure. Near the harbour, we'd pick the outdoor unit's spot for shelter from the sea breeze and get corrosion protection in writing. Either way, one well-sized unit in the main living room beats two small ones fighting a cold house.