When installing a gas heating system, the question always arises whether a hot water storage tank should also be connected to it. In some cases this makes a lot of sense, in others it makes less sense. We will show you the advantages of the variant without a hot water tank below.
Gas heating with or without a hot water tank?
To use a single source of energy for all heat that you need in a residential building is a meaningful idea in itself. And often this is also implemented: mostly in the form of an oil, gas pellet or snowwood supplied boiler, to which a large hot water tank is coupled to the drinking water pipeline system. But also a combi gas boiler can be used for the simultaneous supply of room heat and hot water.
But when it is worthwhile to keep the hot water centrally in direct connection to the heating system and when is a decentralized hot water treatment meaningful? This comes mainly in the nature of the residential building and the individual hot water needs. A decentralized solution is recommended in the following cases:
- Multi-party house
- With low hot water requirement
- For susceptibility to lung diseases
In residential buildings with several apartments, decentralized hot water preparation is usually useful. Because from a certain number of tenants, a central storage system that is much too large and does not fit in a basement would be required. Therefore, in high-rise buildings with many individual residential units, you always find separate space heating and hot water solutions. In single-family homes, on the other hand, the combination of the two is usually more intelligent.
But the individual water requirement also plays an important role in the decision about the connection of the hot water preparation to the heating system. If you only use a little hot water in everyday life, i.e. never take full baths and do not shower for hours, you would be better advised to use a solo gas heater and decentralized water heaters, i.e. boilers or instantaneous water heaters. Because in this way, compared to a little used, possibly much too large reserve storage unit, a lot of energy can be saved in the long run.
Another important argument for installing gas heating without direct hot water connection is the risk of legionella. The multiplication of the rod bacteria that are potentially pathogenic to humans takes place very well in larger, longer standing warm water reservoirs in a temperature range between 30 and 45 ° C. If you do not want to permanently heat the water to at least 55 ° C to prevent infections, you should better rely on decentralized fresh water conditioners such as gas boilers or electric instantaneous water heaters.