Heating cost - currently 77.6 cents per day

We decided to turn on some heating on 30 October after the internal temperature dropped to 19 degrees. To begin with we switched on our underfloor heating circuits in the following rooms (all north facing)

1. Office
2. Utility Room
3. Main Bathroom
4. Master en-suite

Our living rooms are all south facing so they benefit much more from the direct solar gain. On sunny days simply opening the internal doors (along with the heat recovery) ensure that the solar heat spreads evenly around the house.

Each room has a 270 watt circuit connected to a Dev 535 controller which allow timed start/stop and temperature control (measure via floor and/or room sensor).

Our house has a dual tariff meter so we decided to switch the heating on from 00:00 - 08:00 each day with the termostats set to 21 degrees. This will ensure the heating will only switch on if the room temperature is less that 21 degrees.

We are on the ESB ValueSaver NightSaver price plan with the current prices
Cost per unit Day - 19.62 (Inc VAT)
Cost per unit Night - 9.70 (Inc VAT)

With all 4 circuits switched on the total power consumption is 1080 Watts or 1.08KW (a single unit of electricity) the cost for each night is 9.7 x 8 hours = 77.6 cent.

This is the maximum cost as with the recent spell of sunny weather the internal temperature hits 21 degrees therefore the underfloor heating circuits do not switch on.


  1. Just found your blog. That was a very interesting post. We're just in the process of finishing off our near passive Nordica 125 scanhome, in County Leitrim.

    Our blog about our build is at www.adventuresinafield.blogspot.com

    I'd just been wondering what the underfloor heating would cost - so I really appreciate this post. Thank you.

    I look forward to reading more of your posts, all the best, Ferris Jay.

  2. I found just your blogs and read about heating cost, it is really saving for money. I am very interested your idea.

    Electronic underfloor heating

  3. Ferris/Den,

    Now that we have had a few weeks of proper winter weather I will shortly publish a detailed post describing how I am have been heating the house. I will also give estimates as to the heating costs.


  4. if you like our underfloor heating packs then need to know the electric system you install will depend on the size of the room and the type of flooring it has - options include loose-fit wiring flexible enough to fit into small or awkward spaces, electric cable systems, or heating mats you roll out to cover larger areas for underfloor heating packs.

  5. You had done a very good research in this and information you have posted is very helpful, i like your idea and i am sure i will save my money.

  6. I appreciate your work, you had worked very hard on the information you had posted.It will be very helpful to others.