Water-carrying fireplace stove and hot water heat pump

According to the heating load calculation, I have a heat demand of 4789 watts for a single-story new build with approximately 100sqm living area. Hot water demand approximately 120 l / day.

What do you think of a water-bearing wood stove as a central heating system (fuel freely available) and a hot water heat pump?

Kind regards Portoalegre

Nothing, but that's because I wouldn't feel like heating with the fireplace every day. And that for the entire heating period, every year again. I don't even know if there is a suitable fireplace for the low heating output. You have to realize that the heating load represents an extreme, i.e., the heat demand at, for example, -14 degrees Celsius (regionally different). At +5 degrees Celsius, you also have a demand for heating energy, but it is well below 4.8 kW. I cannot imagine that a stove that heats heating water can adequately meet this very low heating heat demand.

I think it's good and I did it like that myself. However, my heating demand is higher. What you definitely need is a buffer tank, preferably as a hygiene tank ([edelstahlwendel für das warmwasser]), then the stove can fill up the buffer. For that, you need about 1 kWh per degree and 1000 liters. So if I put a 1000-liter buffer there and operate it always in the range of 40-60 degrees, then I need 20 kW heating power for one cycle (40 to 60 degrees). That would be about 5 kg of wood.

Please don't stick too strictly to watts and grams now, because I took rough values (water actually needs 1.16 Wh per liter and degree, wood depending on drying level has 3.8-4.4 kW per kg, efficiency depending on stove 60-90%, etc...)

Good morning

Almost right, instead of the WWWP it is better to let a thermal solar system work on the buffer during the summer and the transition period.


Olli

Nothing. Too expensive for too little savings. We currently have 5-6€ warm water costs per month with just the brine-water heat pump without anything else.