Neben der kostengünstigen Warmwasserbereitung kann überschüssiger Strom zusätzlich einfach über einen 800 W Micro PV Wechselrichter in das eigene Hausnetz eingespeist werden.
The economical photovoltaic system for households with low electricity requirements.
The advantages of the fothermo system.
Produce your own hot water and also reduce your electricity costs.
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save money
Reduce hot water costs: With just 3 solar modules, you can generate around 75% of your hot water for a 2-person household almost free of charge.
Reduce electricity costs: Use a balcony power plant inverter to feed excess electricity into your own home grid to save additional electricity costs.
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Easy construction
Plug & Play : Simple plug connections for easy installation.
No electrician necessary : The fothermo system works with protective extra-low voltage. You can build your own photovoltaic system yourself.
Economical photovoltaic system
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Low investment
About 90% lower investment compared to a large photovoltaic system with e.g. 10 kWp.
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3 - 5 years amortization
Free hot water after 3 to 5 years . The fothermo system pays for itself within a few years.
--> Link: Profitability analysis
Everything you need to know about the fothermo system for cost-effective hot water and electricity production for households with low electricity consumption.
Innovative technology that convinces!
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99% efficiency
Direct use of direct current : The electricity from the photovoltaic modules is converted directly into hot water. No inverter is required - this reduces investment costs.
High efficiency : Thanks to the patented MPP tracker, more than 99% of the electricity generated is converted into hot water.
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Simply uncomplicated
Minimal installation effort : All components of the photovoltaic system are simply plugged together. No interference with the house's electrical system.
No bureaucracy: Photovoltaic system that does not require registration. No registration required when using the optional 800 W surplus feed-in via a balcony power plant inverter.
Option 1: Warmwassererzeugung
In diesem Beispiel wird ausschließlich Warmwasser durch die am Solar-Boiler / Solar-Heizstab angesteckten Photovoltaikmodule erzeugt.
Der Strom der Photovoltaikmodule wird direkt in Warmwasser umgewandelt. Sobald das Wasser die maximale Temperatur erreicht hat, wird der Heizvorgang beendet.
Option 2: Warmwassererzeugung mit 800 W Überschusseinspeisung
Wenn mehr Photovolatikstrom zur Verfügung steht, als in Warmwasser umgewandelt werden kann, kann überschüssiger Strom über einen 800 W Balkonkraftwerkswechselrichter ins eigene Hausnetz eingespeist werden. Hierfür wird das fothermo Umschaltgerät (Energiemanager) benötigt.
So lassen sich neben den Warmwasserkosten auch die Stromkosten im Haushalt senken.
Photovoltaic hybrid boiler
The photovoltaic hybrid boiler is the better electric boiler. It replaces every "normal" electric boiler.
The heat is primarily generated by photovoltaic modules. If the sun doesn't shine, the hybrid boiler can automatically reheat with 1,500W via 230V mains power. The boiler is available in sizes 30L and 80L.
Photovoltaic heater
The photovoltaic heating element enables existing buffer storage tanks to be easily retrofitted with photovoltaics. To put the heating element into operation, the photovoltaic modules are simply plugged into the housing.
Photovoltaic 200L and 300L boiler
The 200L and 300L photovoltaic floorstanding boilers provide affordable and C02-free hot water for the whole family. The photovoltaic modules are connected directly to the boiler. An integrated heat exchanger enables connection to an existing gas, oil or pellet heating system in order to be able to sufficiently reheat the water even on cloudy days.
Photovoltaic off-grid boiler
The photovoltaic off-grid boiler offers the ideal solution for a cost-effective and sustainable hot water supply in stand-alone systems such as summer houses, mountain huts or as drinking water pre-heating in front of a heating system or a continuous-flow water heater.
switching device
When the photovoltaic boiler is fully heated, the excess electricity is fed into the home network. The power is fed in via a micro PV inverter. The currents are switched intelligently and fully automatically. With the switching device, you can use even more of the energy you generate.
Applications of fothermo products
Hot water and electricity generation from one system
With just 4x solar modules, 1x solar boiler or a solar heating rod and 1x 800 micro inverter you can generate your own hot water and your own electricity.
The entire system is designed so that you use as much of the electricity you generate yourself as possible. This maximizes the profitability of the solar system. The entire investment is usually paid back after 3 - 5 years .
A 2-person household can cover around 75% of its annual hot water needs with an 80-litre hybrid boiler. Optionally, excess energy can also be fed into the household's own power grid using an 800 W micro PV inverter.
High economic efficiency
cost accounting:
A profitability calculation is then carried out to determine the payback period in years.
Cost of solar hybrid boiler: €699
Costs of 2x photovoltaic modules each 400 Wp: €220
Cable costs: 50 €
Substructure costs: 100 €
Total cost: 1,069 €
Savings per year: €246 (75% of hot water costs)
Payback period: 4.35 years
Payback period = investment / savings = €1,069 / €246 = 4.35 years
The payback period in the example is 4.35 years. After this time, you will have saved your initial investment and you can immediately use free hot water.
Plug & Play - Installation in just a few moments
The solar plugs are already permanently mounted on each solar boiler and each solar heating rod. This makes installation very easy. The solar modules are plugged directly into the boiler/heating rod using an extension cable . See picture.
More than one solar module is connected via parallel connectors . This makes installation very easy.
The simple installation eliminates expensive assembly costs. This makes the entire solar system significantly cheaper to purchase.
90% lower investment costs
Compared to large photovoltaic roof systems, fothermo systems cost around 90% less. There are many reasons for this. The most important are:
No over-dimensioning : A small household with low electrical consumption cannot consume as much electricity as a large rooftop system produces. Most of the energy would be fed into the public power grid almost free of charge.
Easy installation : No intervention in the home electronics is necessary for the entire installation. If you want to feed in excess energy from the solar boiler or solar heating rod, you can do this via a micro inverter (balcony power plant inverter) plugged into the socket . That's all.
The fothermo system at a glance
Testimonials
Founder story - Why did I found fothermo?
"For my father, a large solar roof system was never an option because it would not be economically viable. The problem is that the electrical consumption of the 2-person household is too low. This was the reason for the development of an economical solar system for households with low energy requirements!"
Our vision is to enable all households to economically use photovoltaic energy.
Why fothermo?
fothermo is known from:
Together with our partners, we are making our planet and hot water production a little more sustainable.
