Smart storage heater
radTherm® Dynamo S
The storage heater that charges when electricity is cheapest.
Smart storage heating for dynamic tariffs and solar homes
Dynamo S is a two-stage electric storage heater designed for the way electricity is priced today. Rather than drawing power whenever the room cools, it charges a dedicated row of heat-storage bricks during cheaper or solar-powered hours, then gives that warmth back when you need it, for up to three hours without drawing any power. A second row keeps the room at a steady base temperature in between, so it never goes cold.
Charges on cheaper power
Stores heat during low-price periods or when your solar panels have surplus.
Up to 3 hours of stored heat
Keeps warming the room with no power supply.
Never goes cold
A separate base-load row holds your minimum temperature.
Two rows of storage bricks, two jobs
Only one row heats at a time. The thermostat switches between them automatically, so the heater never draws both loads at once.
Warm the room before you need it
Dynamo S has three temperature modes that work with its charging times.
| Mode | Suggested setting | What it does |
|---|---|---|
| Comfort+ | 23 °C | Used during charging windows: gently warms the room above your usual temperature with cheaper electricity, so there's less to top up later. |
| Comfort | 21 °C | Your everyday temperature. |
| Setback | 18 °C | A lower base temperature for nights and time away. |
Every temperature can be adjusted to suit you.
Works with your tariff, solar panels and smart home
Every Dynamo S has a built-in Shelly smart relay. Connect it to an energy management app or system and the heater can charge to a schedule, respond to price signals from your electricity tariff, or soak up surplus power from your solar panels.
Some energy management apps need a subscription for full functionality.
Energy management systems
- Clever-PV
- Home Assistant
- Homey
- openHAB
- evcc
- ioBroker
Solar inverters (connected through those systems)
- SolarEdge
- SMA
- Fronius
- Huawei
- GoodWe
- Sungrow
Control it on the heater or from your phone
The built-in Smart Control thermostat covers weekly programming, open-window detection and adaptive start, which learns how long your room takes to warm up so it reaches temperature right on time. Set everything with the buttons on the unit, or from your phone or tablet using the app.
Technical specifications
- Two heating rows (one active at a time)
- Patented smart, heat retentive core
- Spot-welded heating fins
- 230 V
- IP20
- Protection class I
- Wall-mounted (support feet on non-load-bearing walls)
- Rooms of approx. 5–16 m²
- White or anthracite
| White | Anthracite | Output per heating row | Dimensions (W × H × D) | Weight |
|---|---|---|---|---|
| Dynamo 500 S | Dynamo-Z 500 S | 500 W | 380 × 630 × 120 mm | 28 kg |
| Dynamo 1000 S | Dynamo-Z 1000 S | 1,000 W | 680 × 630 × 120 mm | 48 kg |
| Dynamo 1400 S | Dynamo-Z 1400 S | 1,400 W | 850 × 630 × 120 mm | 58 kg |
| Dynamo 1500 S | Dynamo-Z 1500 S | 1,500 W | 980 × 630 × 120 mm | 68 kg |
Is Dynamo S right for your home?
Dynamo S is a great fit if:
- you’re on, or thinking about, a time-of-use, dynamic or off-peak electricity tariff
- you have solar panels and want to use more of the power you generate
- the room is roughly 5 to 16 m²
- there’s a solid wall to mount it on, or space for the support feet
Heating a larger room, or need the slimmest possible radiator? The Standard range is just 7 cm deep and goes up to 2.8 kW.
Talk to a local specialist
They'll look at your room, your walls and your tariff, and tell you whether Dynamo S is the right fit.
Find your local distributor
Download the 2026/27 catalogue
80 pages with full specifications for every radiator, panel heater, towel rail and thermostat.
Why radTherm®?
Class-leading electric heating
A combination of natural convection and radiant heat from the fluted design gives gentle, even warmth, much like central heating.
Total reliability
Modern, robust technology with no maintenance or servicing. Every radiator is precision-engineered and made to order in Germany, with a genuine 30-year guarantee.
Economical
100% energy-efficient. The patented heat retention smart core stores heat so well that the radiator needs only a small trickle of electricity to maintain the temperature.
Total control
Every radiator has its own thermostat, so you choose the temperature and times for each room: simple buttons on the radiator, or smart control from your phone.
Modern and stylish
Slim designs only 7 cm deep, made to order in a range of sizes and finishes to suit your home.
Built for efficiency
Our ingenious fluted design multiplies each radiator's effective surface area by six, while the patented smart heat retention core distributes heat across the whole surface.
See radTherm® in your home
Your local specialist will survey your home, recommend the right radiators and fit them for you.