# UNDERSTANDING RUNNING COSTS

### - ELECTRIC FLOOR HEATING RUNNING COSTS

Understanding how much your floor heating costs to run is a popular question, understandably, and with most of us becoming more aware of our electric consumption we advise that you understand your usage so you can use it to your best advantage.

It is a simple calculation that starts with two numbers.

- The heat load of your heated floor (watts) and
- The price you pay for electricity.

#### CALCULATING YOUR HEAT LOAD

The heat load of your floor is noted on all documentation from Comfort Heat. The load is measured in watts and for a typical bathroom will range from around 500 watts to 1200 watts.

If you are unsure of the heat load of your heated area you can call our office or calculate an estimate based on 175 watts per m2.

#### PRICE YOU PAY FOR ELECTRICITY

Finding the price you pay for electricity is on the back of your electricity bill. The unit of measure for your bill is listed in kilowatt hours. If kilowatt hours means nothing to you then then think of it like this.

If your electricity pricing schedule is a flat rate, (Option 1), then to run your 1000 watt vacuum cleaner for 1 hour will cost you 26 cents. If you are on a time of use pricing schedule, (Option 2), then to vacuum for one hour during peak times will cost you 52 cents, off peak time 13 cents and shoulder times 22cents.

There are a few options when it comes to pricing.

Option 1 : One flat rate usually around 26 cents per kWh (kilowatt hour)

Option 2 : Time of Use rates as seen below;

Peak times – 52 cents /kWh [2pm-8pm Monday – Friday]

Off peak – 13 cents /kWh [10pm-7am Monday – Sunday]

Shoulder – 22 cents /kWh [All other times]

#### CALCULATE YOUR ELECTRIC HEATING

**[[watts ÷ 1000] x [price you pay for electricity]] x 0.65 = cost to heat your floor per hour **

*Please note that the above formula is an estimate only. We estimate that the floor will be on 65% of the time after the floor hits temperature, as it will begin to turn on and off maintaining the set temperature. Keeping the heat within the room i.e. door closed will help this percentage stay low.*

### - HYDRONIC FLOOR HEATING RUNNING COSTS

Hydronic heating systems can operate via a range of heat sources but the two most popular are gas and heat pump [electricity].

Similar to electric heating systems you can estimate your gas and electricity consumption via simple formulas.

#### CALCULATING YOUR HEAT LOAD

The heat load of your area is noted on all documentation from Comfort Heat. The load is measured in watts and if you are unsure of the heat load of your area you can call our office or calculate an estimate based on 120 watts per m2.

#### PRICE YOU PAY FOR GAS

Finding the price you pay for gas is on the back of your gas bill. The unit of measure for your bill is listed in megajoules (MJ). In the below formula we will convert megajoules to kilowatts.

There are many options when it comes to pricing but in the below example you are paying;

Block 1 – 3 cents

Block 2 - 2 cents

#### CALCULATE YOUR GAS HEATING

**[[price you pay for gas x 3.6] x [watts ÷ 1000]] x 0.65 = cost to heat your floor per hour **

*Please note that the above formula is an estimate only. We estimate that the floor will be on 65% of the time after the floor hits temperature, as it will begin to turn on and off maintaining the set temperature. Insulation will play a large factor in keeping this percentage low.*

#### CALCULATE YOUR HEAT PUMP HEATING

**[[[watts ÷ 1000] x [price you pay for electricity]] x 0.65] ÷ 3 = cost to heat your floor per hour**

Reference the above information in electric heating for pricing.

Due to the COP (co-efficiency performance) of heat pumps the total price for electricity is divided by 3.