Radiant Floor Heating

Running Costs

How much does it cost to run is obviously one of the most common questions we get & the short answer is that it can vary quite a bit. The size & design of your home, the temperature you want to achieve & the choice of using off-peak or standard rate power will all affect the heating costs.

Whilst here in Australia, insulation levels may not be as good as many European countries where floor heating is one of the most popular forms of heating, this is usually compensated for by the fact that our external winter temperatures are in most cases, considerably higher. If you want to reduce your carbon footprint & keep heating & cooling costs to a minimum, consideration should always be given to a good solar passive design & the highest levels of insulation that are practical within your budget. Increasing ceiling insulation to R5 or R6 & even double glazing the windows will usually always pay for themselves over the long term. Many people are also now adding PV ‘solar power' to their home design, again to reduce power bills.

Our best advice on this subject if using under floor heating as your main winter heating system would be to carefully consider using off peak power where available as this can often result in savings of close to 50% compared with standard tariffs.

Heat Output

The typical heat output in an average installation is around 120-130 watts per square metre for the available free floor area in main living areas (family/dining/kitchen etc.) However in bathrooms we usually increase the output around 200w/sqm in bathrooms to ensure higher comfort levels & a faster response time.
Advanced Control
The advanced digital thermostat we use in our installations measures the temperature in regular 15 minute cycles & then delivers just the right amount of power during the next cycle in order to maintain a constant temperature. This ensures energy is not wasted & also avoids the 'peaks & troughs' associated with many other forms of heating.

Examples:

Typical Bathroom - 4 sqm heated floor area (excluding bath/shower/vanity)

A typical bathroom installation would require a 600 to 800 watt system and based on 90 days x 4 hours per day x 0.8kw = 288kwh. At the current standard tariff price of around 18 cents per hour, the total bathroom running cost would be around $50 for the 3 month period (this cost would be approx HALVED if off-peak power was used)

Family/Dining/Kitchen - Standard Tariff

In a typical installation for a family / dining / kitchen of say 70sqm, less approx. 10sqm for non-usable space such as kitchen cupboards/TV recesses etc a 7kw system would usually be installed. The cost is over a 3 month winter period (90 days x 8 hours per day = 720 hours) with a duty cycle of factor of approx 40% the expected consumption would be approx 2.8kw (40% of 7kw) x 720hrs = 2016 kWh. At current average prices of around 18 cents per hour this would work out at approx $360 per year, or $120 per winter month

Family/Dining/Kitchen with Off Peak

The same calculation with off peak running the heating overnight for 10 hours from 2100hrs-0700hrs would work out 900 hours x 2.8kw 2520kwh @ 9.12 cents = $230 per year ($77 per winter month)

These calculations are for illustration purposes & as stated above, it should be noted that the running costs will vary from state to state & are dependent on the size & design of home, the desired temperature & current electricity prices.

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