Which fothermo product is right for me?

fothermo offers a wide range of innovative solar boilers and solar heating rods that make it possible to generate hot water efficiently and sustainably using solar energy. But which product is right for you? In this article, we will help you find the right solution for your individual needs.

How do you currently prepare your hot water?

Before you decide on a fothermo product, you should consider how you currently generate your hot water and what requirements you have for a sustainable and efficient solution? The following list shows which current hot water preparation systems can best replace or supplement them.

Electric boiler --> Solar hybrid boiler: The hybrid boiler replaces a classic electric boiler. It primarily uses photovoltaic power to heat water. If required, the water can be reheated with a powerful 1,500 W. A 2-person household saves around 75% of hot water costs per year with a hybrid boiler.

Electric instantaneous water heater --> Solar off-grid boiler: The off-grid boiler heats water exclusively with photovoltaic power. This makes the off-grid boiler ideal for preheating water for an electric instantaneous water heater. The pre-heated water reduces the instantaneous water heater's power requirements. You would connect the solar off-grid boiler in front of the instantaneous water heater so that the pre-heated water supports the instantaneous water heater.

Gas, oil, pellet heating --> solar storage tank or solar heating rod : An existing gas heating system can be supported with either the solar storage tank or the solar heating rod. If your existing hot water tank has a 1.5 inch flange, you can simply retrofit the solar heating rod. If this is not the case or you need a new hot water tank, then the solar storage tank with 200 liters or 300 liters is recommended.

Garden shed, camping, mobile homes, mountain hut --> Solar off-grid boiler: The off-grid boiler is perfect for applications without a 230V power connection. With this boiler you can make your hot water self-sufficient.

How much hot water do I need?

The right product also depends on your daily hot water requirements. Below you will find a list of recommended products for every household size. The list is intended as a rough guide. The actual hot water requirement depends on your own needs.

1 person household = 30 liters and 80 liters solar boiler, heating element

2 person household = 80 litre solar boiler, heating element, 200 litre and 300 litre storage tank

3 person household = 80 litre solar boiler, heating element, 200 litre and 300 litre storage tank

4 person household = heating element, 200 litres and 300 litres storage tank

5 person household = heating element, 200 litres and 300 litres storage tank

6 person household = heating element, 200 litres and 300 litres storage tank

Summary :

Choosing the right fothermo product depends on the current hot water preparation, daily hot water requirements and individual requirements. Depending on the size of the household, there are different recommendations for boilers and storage tank sizes. This means that everyone can find the optimal solution for a cost-effective and economical hot water supply.

If you have any questions, please feel free to contact us by phone or email. Link to contact details.

Most standard photovoltaic modules are compatible with fothermo products. To improve heating performance, some basic aspects should be considered: choosing the right number of photovoltaic modules, optimal orientation for maximum solar radiation and keeping cable runs as short as possible to minimize power losses.

The fothermo photovoltaic system has been specially developed for households with low annual electricity consumption. These are usually 1 to 3 person households without their own heat pump or electric car. The annual electricity requirement is between 1,000 kWh and 3,000 kWh. The resulting electricity costs are therefore around €400 to €1,000 per year.