BER to € running costs

west side kid

Hello

A layperson here, I am looking for a quick calculator (or method) by which you can convert a BER (plus knowledge of your house metres)

I have a 240 sq meter E2 rated that I am looking to renovate. But I'd like a handy way to know the cost of moving from a E2 to a higher rating.

When I tried to use the SEAI typical energy costs per KwH, I got a figure >10,000. When I use the table in this, I get about 5000 euro?

Cheers,

MOTM

Bearing in mind that DEAP doesn't model your houses actual energy usage (it uses standardised assumptions about running hours, temperatures etc):

Take the delivered energy and each fuel type shown on the results tab of DEAP. Ask your BER assessor for this info (or it'll be in the detailed report on the results page). Multiply the delivered energy*fuel cost/kWh for each fuel using the fuel costs/kWh on the SEAI fuel cost comparison.

Note that DEAP won't give any indication for the capital costs of renovation works...just gives you an estimate of teh energy and fuel cost savings.

water-man

I have also been thinking about something similar to the OP. Sorry for hijacking your thread but I think its along the smae lines.

I have just got the results of a provisional BER for a new build. Result was 57KWh/m^2/Year.

Now, as my house is a 200m^2 does this result tell me I need to use approx 12,000KWh/year for heat and water?

If I assume electricity is approx 20c/KWh. That will give me a bill of Eur2400/year. Seems very high.

So, if I'm using a heat pump with a COP of lets say 4 will this then reduce the bill to Eur600/year for heat and water?

Or is there another way to understand the result?

Thanks for reading.

WM

MOTM

water-man wrote: »

I have also been thinking about something similar to the OP. Sorry for hijacking your thread but I think its along the smae lines.

I have just got the results of a provisional BER for a new build. Result was 57KWh/m^2/Year.

Now, as my house is a 200m^2 does this result tell me I need to use approx 12,000KWh/year for heat and water?

If I assume electricity is approx 20c/KWh. That will give me a bill of Eur2400/year. Seems very high.

So, if I'm using a heat pump with a COP of lets say 4 will this then reduce the bill to Eur600/year for heat and water?

Or is there another way to understand the result?

Thanks for reading.

WM

No, the 57kWh/m2 is primary energy, accounts for the expected performance of the dwelling components (including heat pump COP of 4). The figure for energy delivered to the house (on which bills are paid) is much lower. For example 1kWh electricity arriving at your house requires about 2.4 kWh primary energy (in DEAP).

If all of your lighting/heating/ventilation/DHW/pumps/fans is from electricity (i.e. all of your fuel in DEAP is electricity), then the 57kWh primary is about 24kWh delivered electricity. For 200m2 thats 4800kWh for lighting/heating/ventilation/DHW/pumps/fans.
If you're paying 20c/kWh thats €960. Cheaper I guess if you can get a better avge price than 20c/kWh using night rate where possible. Again, this is all based on standard assumptions. If you keep the house colder/hotter and use more/less water than DEAP for example, then the running costs will differ.

See figure 5 here: http://www.seai.ie/Your_Building/BER/BER_Assessors/Technical/DEAP/Introduction_to_DEAP_for_Professionals.pdf