That is one of our most common questions, and we at Premier Heating have been monitoring one of our installations in New Plymouth for the past 2 years and we are pleased to share a snapshot of the data with you.
The house we have been monitoring is home to a family of 5, including 3 children. It was built in the 1940's, is 180m2, has a 2.7m stud height, 2 x living rooms, 4 x bedrooms, en-suite, bathroom, toilet and kitchen. Although ceilings and underfloor are insulated, the heat loss in the home is significant due to no wall insulation, single glazed windows throughout and no curtains in the living areas.
The solution we installed was a gas boiler, connected to natural gas, radiators in each room and heated towel rails in the bathrooms. The bedroom and bathrooms are one zone and the living areas another, meaning the zones can be independently controlled. Providing the smarts to schedule and operate the heating system are Google Nest thermostats. These thermostats not only allow you to turn your heating on and off from anywhere in the world via a smart phone, but are smart enough to detect when the entire family has left the house and will turn the system off themselves.
The period we are reporting on is Winter 2018 (June, July and August). The average outside temperature in New Plymouth during this time was 10 degrees for June & July and 11 degrees for August. Our family throughout these months used heating every day and they maintained healthy average temperatures of:
19 degrees in the bedrooms throughout the night (8pm - 6am)
19 degrees in the living areas throughout the day (6am - 8pm)
These temperatures are average and during the period where the family was actively using the spaces in the home, the temperatures were in excess of 21 degrees. For example during the morning routine of 6am - 9am the entire home was an average of 21 degrees.
For the entire winter period (3 x months) the family used $338.32 worth of gas, which equates to $112.77 per month, or $3.67 per day - less than a cup of coffee!
When you consider that consumer.org.nz states that to keep a wood burner going most evenings and weekends through winter you’ll need at least 10 cubic meters of wood, at a minimum price of $50 per cube. That equates to $5.43 per day to heat only your living area with a wood burner compared to $3.67 for your entire home with central heating.
This figure can be reduced even further when central heating is installed in a modern home with greater heat retention features such as double glazing and insulated walls, and reduced further more with our innovative ground source heat pump and solar solutions.