Heating calculator: power sizing and equipment selection
Find the required heating power and tank volume for your home or apartment in Estonia — and get a recommendation for a specific model from our catalogue right away.
Working out the right boiler or heat pump power yourself is hard — it takes knowing your home's heat loss, hot-water usage norms, and the actual equipment lineup. The Gerold CO2 calculator gives you an engineering estimate in 3 short steps: based on your home type, heat source, area and number of residents, we calculate the required power in kW and the DHW tank volume in litres.
You get more than just numbers — a specific equipment recommendation from our catalogue, with its price and a link to the product page. This doesn't replace a full engineering heat-load calculation, but it gives you an accurate, practical starting point you can already use to request a quote.
What do you need to heat?
Choose the property type.
What type of home do you have?
This determines heat loss per square metre.
Which heat source interests you?
The available options depend on the property type.
Which type of heat pump?
Property parameters
Heated area and number of residents — to size the power and tank.
This is an approximate estimate based on average heat-loss figures for Estonia (40–60 W/m²) and standard hot-water usage norms. A Gerold CO2 specialist will calculate the exact figures for your property.
How the calculation works
Home type
A new, insulated home or an older, uninsulated one — this determines heat loss per square metre (40 or 50-60 W/m²).
Heat source
A heat pump (ground source or air-to-water) or a gas boiler — this determines which equipment we'll recommend.
Area and residents
Heated area and number of residents — to size the power and the required DHW tank volume.
Result: kW + equipment
The required heating power, tank volume, and a recommended heat pump or boiler model from our catalogue, with its price.
Heating solutions we install
Want to explore the options in more depth? Each heating solution has its own page covering benefits, use cases, and how they can be combined.
Solar energy
High efficiency!
Solar energy isn't just the most environmentally friendly option — it's also highly efficient, with low maintenance costs. The solar heating system we offer is an excellent way to cut your energy costs, regardless of fluctuations in electricity prices.
More about this solutionGas heating
Convenient and cost-effective!
Today, the most convenient heating solution is a reliable gas heating system. Gas offers significant advantages over other energy sources. Gas heating systems are more environmentally friendly, and their maintenance costs are 30–40% lower than those of electric and oil-fired heating systems.
More about this solutionHeat pumps
A heat pump helps you save!
Heat pumps help you save money by drawing on energy from the ground, groundwater and air as a heat source. Heat pumps capture thermal energy and channel it efficiently into heating and hot water. At the same time, around 25% electricity input is enough to produce 100% of the useful heat output.
More about this solutionInfrared heating
The most practical solution in the world!
Infrared heating solutions are considered the most practical, economical and long-lasting solutions in the world. This type of heating system is so efficient that it achieves 96% efficiency. Infrared heating can be used as either a primary or a supplementary heat source.
More about this solutionFrequently asked questions about the heating calculator
If something's missing, just send us a request and we'll answer you personally.
The calculator uses average heat-loss figures for Estonia (40 W/m² for insulated homes, 50-60 W/m² for older ones) and standard hot-water usage norms per person. It's a solid engineering starting point, but a Gerold CO2 specialist will work out the exact figures for your specific walls, windows and ceiling height after visiting your property.
If the required power exceeds the models currently listed in our online catalogue, we say so honestly and suggest leaving a request — our specialist will put together a solution individually, including from a wider Bosch lineup than what's shown on the site.
Our online catalogue currently lists air-to-water heat pumps. Ground-source (geothermal) systems are sized individually after a site visit — leave a request and we'll advise you.
Yes, we work with ESTO instalment financing — a heat pump, boiler or tank purchase can be spread over several months without paying the full amount upfront. See the ESTO instalment page for details.
Run the calculator with approximate figures for area and number of residents — you'll immediately see a rough power requirement and matching equipment. Then leave a request via the "Get an exact quote" button: our specialist will clarify the details and visit your property if needed.
They're two different priorities. "Savings" means low heating bills long-term (usually a heat pump). "Ecology" mainly means offering solar panels for heating and hot water — the cleanest energy source, though not always the cheapest upfront.
Need heating advice?
Tell us about your property — we'll find a cost-effective, reliable heating solution and prepare a quote.