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
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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.

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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.

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

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Radiators
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Circuits
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Total Cost
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Annual Running Cost
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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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Solar Heating

Solar: Panels, Solar Hot Water

Evacuated tubes, Flat panel collectors, which type? Will this work with central heating?

Solar energy is free, plus once installed requires next to no effort and the running costs are about the same as a light bulb. So what is the best system?

Have you been to a home show where they all claim theirs is the best. There are many types of flat plate and tube collectors with different absorber coatings, methods of manufacture & internal design, some with reflectors and some evacuated. All have their conversion efficiency tested and available but an efficiency over 70% is rare.

The two important things to consider with solar heating are:

  • The system components are sized in relation to each other and your water use.
  • How much energy is available from the sun.

The level that the suns energy arrives on the globes surface is dictated by latitude and atmospheric conditions only and in New Zealand is sufficient to meet most household hot water needs in summer but not winter. Here in New Zealand the suns energy is less than ¼ in winter than in summer.

Solar may easily be incorporated into a central heating system with the boiler only heating your hot water when the solar cannot keep up.

So how much energy can I expect from the Sun?

The clever people at NASA have calculated all this for us, have a look here for your exact insolation rates and whole lot more! http://eosweb.larc.nasa.gov/cgi-bin/sse/grid.cgi?uid=3030 Bit of a scientists web site so here’s some summarized data here:

The figures are kWh per square meter per day

Location Year Average
Kaitaia 4.1
Auckland 4.2
Hamilton 3.9
Wellington 3.9
Nelson 4.0
Christchurch 3.7
Dunedin 3.2
Queenstown 4.0
Invercargill 3.4
Chatham Islands 3.4
Scott Base 2.6

See the full table

Did you know?

In Europe, evacuated tubes are recommended only where there may be over 30 frosts per year, otherwise flat panel collectors are the favoured option.