Location Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Average
Kaitaia 6.0 5.4 4.6 3.2 2.4 1.9 2.1 2.8 3.8 4.7 5.5 6.1 4.1
Auckland 6.4 5.6 4.7 3.3 2.3 1.8 2.2 2.8 3.8 4.9 5.8 6.4 4.2
Hamilton 6.0 5.3 4.6 3.1 2.1 1.7 1.9 2.5 3.5 4.4 5.5 6.1 3.9
Wellington 6.6 5.5 4.5 2.9 1.8 1.4 1.6 2.3 3.4 4.7 5.8 6.3 3.9
Nelson 6.5 5.7 4.2 3.1 2.1 1.6 1.7 2.4 3.7 4.8 5.8 6.4 4.0
Christchurch 6.1 5.2 6.0 2.6 1.7 1.3 1.4 2.1 3.4 4.7 5.7 6.2 3.7
Dunedin 5.1 4.8 3.3 2.3 1.4 1.0 1.3 1.9 3.1 4.0 4.8 5.3 3.2
Queenstown 6.6 5.8 4.3 2.8 1.8 1.3 1.6 2.4 3.6 5.0 6.0 6.8 4.0
Invercargill 5.7 4.9 3.3 2.2 1.3 1.0 1.2 1.9 3.1 4.3 5.5 6.0 3.4
Chatham Islands 5.6 4.7 4.2 2.4 1.5 1.1 1.3 2.0 3.0 4.2 5.3 5.8 3.4
Scott Base 7.1 3.8 2.5 1.3 1.1 0.0 0.0 0.0 0.7 3.1 6.5 8.1 2.6
The Boilerhouse Specialists in central heating systems.

Looking at home heating, considering central heating? You've come to the right place. We will guide you through the choices you need to make to decide which central heating system is right for you.

Get a free quote

Build your own central heating system

A 3 step process: use our calculator to determine your heating needs, then select the components of your customised central heating system.

Step One: Design your system

There are several variables in determining how much energy each room needs. Here you can enter the details for each space & build up a total home system.

Add Room
Hours a Day Days a Week Months a Year Annual Running Cost$
Winter Power Price$ per kWh Annual Running Cost (electricity)$

Step Two: How much will it cost?

Central heating can be a significant investment and we’d like you to be sure this is realistic for you. There’s quite a few factors in pricing a system but you do need to know what sort of cost is involved in central heating. From your heat loss calculations and system selections we’ve got a pretty good idea of the initial and on-going running costs you’re looking at for a central heating system. Most importantly, alter the fuel to see the impact on running cost.

Total Cost
Annual Running Cost

Step Three: Upload your details

Now that you’ve seen what is possible, refined your homes’ heating and decided that central heating is for you; here’s the next steps. We invite you to send your choices, plans and contact details to us. We’ll be in touch soon to discuss your best way to get the warm home you deserve.

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Thank you for taking the time to send us your information, we will get in touch with you shortly.

Radiators & Underfloor

Radiators or Underfloor heating, what will be best for you?

Room Heating Options

  Benefits Downsides
Radiators Quick response time, turn the radiator on and the room is warm in less than half an hour.
Option of towel rails for bathrooms.
 Needs wall space.  Limits furniture placement.
Underfloor heating
Hidden, so walls are completely clear.
Even temperature from the floor up.
Slow response time, from cold floor to feeling warm can be 24+ hours.
Only possible in new build or major refurbishment.
Floor covering choice may affect performance.
Running costs may be higher with losses from the slab.

Radiators and Underfloor

Underfloor only

Radiators only


Here’s a way to look at this choice: Underfloor systems originate from continental countries, with continental climates. At summer's end, autumn is brief and then it is consistently cold for months, which is perfect for underfloor heating.

New Zealand has an island climate with wide temperature variations over a few days. In this instance radiators come into their own.

Have both? Why not, underfloor in the bathroom is divine and living areas where wall space may be limited work well too. We do suggest the living space has another heat source, say a fire, for unexpected cold days and ambience.

A big consideration with these systems is that they tend to require a substantial upfront investment. They also tend to be fairly inefficient in small spaces, and are better suited to large rooms or an entire home.

"When we were building our plumber didn’t give us any information or choice! But if we were building again we would definitely never be without central heating but, I’d go for radiators. There’s better control for each room and it is faster to heat up."
Susan - Dunedin

What we call a radiator was invented by Russian Franz San Galli, in St. Petersburg around 1856. We’re not quite sure why they’re called radiators as the majority of the heating radiators give is by convection; warming the air and everything else in the room. True radiant heating effect is dependent on a high source temperature (e.g. Fire) so can be unsafe for every room.