What is a sustainable traditional energy system (DTS)?

A sustainable traditional energy system, abbreviated DTS (from the Dutch Duurzaam Traditioneel Energiesysteem), is a hybrid installation in which a conventional gas boiler or other traditional heating or power source is combined with one or more renewable sources such as photovoltaic panels, a heat pump or a pellet stove. The combination cuts energy costs and CO₂ emissions while preserving the comfort and security of supply of a traditional system.

Components

A DTS typically consists of:

• Traditional heat source — usually a high-efficiency gas boiler
• Renewable source — hybrid heat pump, solar thermal, PV panels or pellet stove
• Smart controller — decides which source delivers when
• Buffer or hot water storage tank — stores heated water for peak periods

Operation

The controller automatically switches between sources:

1. In mild weather — heat pump or solar thermal provides heating
2. In hard frost — the gas boiler steps in when the heat pump cannot keep up
3. With surplus solar power — heat is stored in the buffer tank
4. During grid congestion — the boiler takes over to relieve the electricity grid

Application

DTS systems are used in:

• Existing dwellings — as a stepping stone to fully sustainable living
• Heritage buildings — where full heat-pump retrofit is difficult
• Non-residential buildings — offices with variable loads
• Transition phases — until the building is fully insulated

Advantages

• Lower investment than a complete switch to a heat pump
• Comfort retained at peak cold
• Quick payback — typically 5 to 8 years
• Phased upgrade — modular and expandable

Points of attention

• Correct commissioning is essential for savings
• Combined with insulation boosts efficiency
• Two systems to maintain
• Subsidies may support installation costs

Related terms

• Durability class
• Combi boiler
• Energy label
• Heat pump
• Solar thermal

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