Instantaneous water heater or small storage tank: which solution is right for the kitchen and guest WC?
Anyone who needs hot water in a guest WC or in a small kitchen is often faced with the question: instantaneous water heater or small storage tank? Both appliances solve the same basic problem, but in different ways and with different levels of convenience, space requirements and operating behavior. This article explains the differences clearly and practically.
How an instantaneous water heater works and when it is suitable
An instantaneous water heater heats water directly as it flows through without storing it beforehand. The appliance works on demand: it only heats when water is flowing. This means no standby loss, no legionella problems due to stagnant hot water and a compact design that takes up little space.
The disadvantage: instantaneous water heaters require a high connected load to bring the water up to temperature in a short time. Depending on the tap volume and desired water temperature, 3.5 to 21 kW or more are required. Smaller output levels are often sufficient for guest WCs and hand basins with low volume requirements. The water heaters from S.I.T. Sanitärtechnik cover various output ranges.
The small storage tank: convenience in the smallest space
A small cylinder stores a limited amount of hot water that is immediately available when needed. Typical volumes are between 5 and 30 liters. This is perfectly sufficient for washing hands, washing dishes in small quantities or for hot water requirements at rarely used tapping points.
The convenience advantage: hot water is available immediately, without waiting. Anyone familiar with instantaneous water heaters with hydraulic triggering knows that no heating process starts if the flow rate falls below the minimum flow rate. This problem is completely eliminated with the small cylinder.
Which solution suits which location?
For the guest WC, which is rarely used, a small cylinder is often the more convenient choice: the hot water is immediately available, the connection requirement is low and installation is uncomplicated. For a kitchen with regular hot water requirements, where larger quantities are needed, an instantaneous water heater can be more economical because there is no standby energy loss.
The specific framework conditions are always decisive: available connected load, available space, frequency of use and comfort requirements. If you are not sure, you should discuss the decision with a specialist installer.
Conclusion: Decide on instantaneous water heater or small storage tank according to usage profile
Neither instantaneous water heaters nor small storage tanks are the better solution across the board. The instantaneous water heater is convincing for continuous demand and where hygiene is an issue due to standing water. The small storage tank scores points for its immediate convenience and low connection requirements. S.I.T. Sanitärtechnik offers both variants for different application scenarios. Contact us for an individual recommendation.
