Dimplex Highlights Differences Between Direct-Acting and High Heat Retention Heaters

Choosing Between Direct-Acting and Storage Heating Systems

Electric heating specification requires a clear understanding of how different space heaters interact with domestic energy tariffs. Dimplex has detailed the operational distinctions between direct-acting electric heaters and High Heat Retention (HHR) storage heaters, aiming to help electrical contractors and installers specify the correct equipment for residential projects.

Direct-acting space heaters convert electricity into immediate heat, making them suitable for supplementary heating or rooms with short, intermittent occupancy. However, because they draw power continuously while active, operating costs directly reflect peak energy rates. In contrast, High Heat Retention storage heaters are designed to absorb and store thermal energy during off-peak periods—such as those offered on Economy 7 or time-of-use tariffs—and release it gradually throughout the day. Modern HHR units feature enhanced insulation to retain stored energy efficiently until required, minimizing heat loss during unattended hours.

Practical Implications for Purchasing and Installation

What does this mean for a UK tradesperson or DIYer actually buying this kit — does it change what they should pay, buy, or watch out for?

For electricians and homeowners sourcing heating units from trade outlets like Screwfix, Toolstation, or electrical wholesalers, the primary trade-off is up-front hardware cost versus ongoing running expenses. Direct-acting panel heaters and convector radiators carry a lower initial price tag and involve simpler, lighter wall-mounting procedures. However, fitting them into properties running on off-peak tariffs can lead to excessively high energy bills for end users. Specifying HHR storage heaters requires higher initial capital outlay and consideration of product weight during wall fixing, but it unlocks significant running-cost savings where time-of-use tariffs are present. Installers must check the property's tariff structure before purchasing equipment to ensure the chosen system delivers genuine long-term value.

Key Takeaway for Installers

Always verify the customer's electricity tariff before specifying heating units: direct-acting panels suit occasional-use spaces, while HHR storage heaters are essential for maximizing off-peak tariff savings.

Reported by Professional Electrician — original article