Investment choice? You have seen on our website that a heat pump is a sensible choice for a new home. We have also mentioned that in the long term a heat pump that uses geothermal energy is better than an air/water heat pump. Being able to choose is usually a fun experience, but sometimes also difficult.
Aside: There are people behind the former 'iron curtain' who can now choose from 25 types of butter, who long for that one package in the store. But that is not what this is about.
Choosing can also be less fun and sometimes difficult. In addition, it is (unfortunately) the case that the people who can invest the most at the start of new construction (have money) turn out to be the cheapest in the long run.
*Tip: → Buying a heat pump? Always compare before you buy. Fill in the form and receive quotes from specialists. Compare and save up to 30%! Request quotes !example! 6 kW home.
We take a simple house where a 6 kW heat pump is included. (120 m² floor area / no wtw calculated by making a transmission) We can opt for a brine water / heat pump:
Purchase of 6 kW combination heat pump (with built-in cooling and tap water) €8,000. Purchase of vertical source (incl. drilling) €3,500. Together €11,500.
With correct transmission, the heat pump will operate for approximately 2000 hours per year for heating. Assumption of hot water: 400 hours per year. Cooling: 400 hours per year.
Energy costs per year: 6 kW: 4.5 (annual COP / SPF) = 1.33 kW from the grid 1.33 kW x 2000 hours = 2666 kWh per year heating 6 kW: 3.1 (tap water COP) = 1.93 kW 1.93 kW x 400 hours = 772 kWh per year tap water Cooling: (2 pumps of 70 Watt each) 140 Watt x 400 hours = 56 kWh per year cooling Total 2666 kWh + 772 kWh + 56 kWh = 3494 kWh per year x € 0.20 = € 699,-
These costs + purchase over 15 years: € 11,500 (purchase) + (15 years x € 699 energy costs) = € 21,985.
If we choose an air/water heat pump:
Purchase of an air/water heat pump (split unit) of 6 kW: (outdoor unit € 2823,- + indoor unit € 3524,-) = € 6347,-
6 kW : 3.2 (COP year / SPF) = 1.87 kWh from the grid 1.87 kW x 2000 hours = 3740 kWh for heating 6 kW : 2.7 = 2.22 kW x 400 hours = 888 kWh for tap water (With the ground/water heat pump we cooled passively with the source 400 hours x 5.13 kW source power, the cooling capacity delivered is then 2052 kWh) With an air-to-water heat pump we have to do this actively (after all, the outside air is warmer when we want to cool) 2052 kWh : 3 (COP) from the grid: 684 kWh cooling per year Total kWh = 3740 + 888 + 684 = 5312 kWh x € 0.20 = € 1062.40 per year energy costs
These costs over 15 years: €6347 (purchase) + (15 years x €1062.40) = 22,283 euros
New choice air/water + PV panels:
We use the same purchase price for the brine/water heat pump, but we take the air-water heat pump. Available for purchasing devices: 11,500 euros. The air/water costs 6347, - so we keep € 5,153. In addition, we take a PV package of 16 panels, total 3840 Watt Peak for € 4695, - Expected yield of these PV panels (oriented to the south in the Netherlands is certain) Factor 0.85 x 3840 (installed WP capacity) = 3264 kWh per year. The consumption of the air/water does not change and is therefore 5312 kWh per year. Of this we generate 3264 kWh per year ourselves, consumption is then: (5312-3264) = 2048 kWh per year. 2048 kW x € 0.20 = 409.60 per year
Total costs over 15 years €6347 (wp) + €4695 (PV) + (15 years x 409.60) = 17,186 euros.
Brine/water heat pump + PV For the heat pump we needed 3494 kWh per year. We generate 3264 kWh per year, so we only consume 230 kWh per year. (x 0.20 = € 46) Purchase: € 11,500 (wp) + € 4695 (PV) + (15 years x € 46) = 16,885 euros.
Summary In this comparison we have looked at which device or combination sometimes works out better. How do you invest the money you have available in new construction the best. Note: this comparison is purely an example, the 'man-hour costs' and delivery installation are not included. We assume for convenience that these do not differ that much. For all mentioned installations an almost identical low-temperature delivery system is required. Result in this example Investment € 11,500, - Brine/water heat pump gives
