Radiator & Central Heating

FLOW Plumbing & Heating specialise in Warm Water Heating Systems including Underfloor Heating and Radiator Central Heating. Warm Water Central Heating systems are designed to heat your whole house efficiently with maximum temperature control in all areas.


A central boiler running on natural gas, diesel, LPG or electricity heats water; this then circulates through a network of pipes to a series of radiator panels. The hot water heats these radiator panels before returning to the boiler to be reheated and re-circulated. The radiators heat quickly to provide radiated and convected heat. This results in a clean, silent, draught free and very comfortable form of whole house heating. In other words ‘A Better Heating Solution’.

A fully programmable thermostatically controlled Radiator Central Heating system gives you the flexibility to heat the whole house, or heat different rooms, to different temperatures, at different times of the day.



Underfloor and Central radiator heating is a totally dust free, allergen free form of heating making it ideal for medical conditions such as asthma.


Radiator Central has the ability to warm up and cool down quickly. It is an ideal heat for New Zealand’s seasonal temperatures. Heating a room by both radiant and convection, it creates a more comfortable heat.

Cost Efficient

A radiator heating system will cost around 20% less to operate than a ducted system in a house with 2.7m ceilings. Those homes with higher ceilings will see even greater cost savings of around 30-40%.

Renovate / New / Retrofit

When there is access below the floor, radiators are the simplest and least invasive to install.


Whether you have a classic villa, a modern masterpiece or your first home, there will be certain radiators to suit your taste. Underfloor heating systems also allows a minimalist design, providing heating that cannot be seen.


An underfloor and radiator central heating system gives you the flexbility to heat the whole house, or heat different rooms, to different temperatures, at different times of the day.

How does radiator central heating work?

Hydronic radiator based heating systems use a heat source such as a gas boiler to generate hot water which is silently circulated throughout your home passing through a collection of radiators. The energy from the hot water is transferred from the radiator into the room via a combination of natural convection and radiation before returning to the boiler for reheating and repeating the cycle. Heated towel rails can be included in the heating circuit which is a nice addition for keeping your towels warm and dry, but also drying lingering damp air from the bathroom.

Where are the radiators manufactured and from what material?

All of our radiators are designed and made in Europe by well known and respected suppliers. Depending on the style, our radiators are made from die-cast aluminium or steel and finished in a durable powder coat finish.

What size radiator should I use?

Our tech team will consider the size and volume of each space, along with the size of doors and windows to calculate the specific heat load (watts) required to maintain a comfortable temperature. This figure can then be cross referenced against a wide range of radiators to find an optimal size and shape that works in the room. A range of options might be possible so long as the output meets or exceeds the rooms requirement.

Can I combine my radiators and underfloor heating into a dual system?

Yes this can be done, but underfloor and radiator systems run at different temperatures so adds to the complexity and therefore the cost. 1 t is a nice option if you have a reasonable size ground floor with underfloor heating, and a second level with a timber floor construction which lends itself to radiators.

What heat source runs my radiator system?

Your radiator system is heated by your boiler (generally located in the garage or laundry), and the energy source is decided by the cheapest available fuel in your region e.g. natural gas, LPG, air-water heatpump, diesel or wood. The choice of a wood burning boiler (wetback on a large wood fire), however requires effort on your part to keep the wood fire burning constantly.

How do I control the temperatures?

The heating system is primarily controlled by a master programmable thermostat which turns the system on and off according to your preferences. It is normally located for user convenience in the main living space.

A thermostatic head fitted to each radiator maintains the temperature of individual rooms independently from the master (subject to the master turning the system on). This is particularly useful if a room is unoccupied or disproportionately warmed by the sun.

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