Infrared heating and solar: a better match than most
A low-voltage DC heating element can run straight off solar panels or a battery with no inverter in the path. Why infrared and PV pair unusually well, and what it takes to do it properly.
Most heating systems can be run from solar panels in the trivial sense that most things can: the panels feed the house, the house feeds the appliance. That is true of a heat pump, a storage heater and a kettle.
Infrared pairs with solar rather better than that, for reasons worth setting out properly.
Electricity in, heat out — nothing in between
An electric infrared element converts effectively all of the electricity it draws into heat in the room. There is no combustion, no flue, no heat exchanger and no distribution medium. The US Department of Energy treats electric resistance heating as essentially 100% efficient at the point of use, and that is what it is.
That matters for solar because it means the arithmetic is simple. A kilowatt hour off the roof is a kilowatt hour of heat in the room. There is nothing in the chain to be lossy about.
The DC advantage
This is the part specific to our systems, and it is the strongest technical argument.
Solar panels produce direct current. Batteries store direct current. Your mains supply is alternating current, so a normal installation runs the panel output through an inverter to make AC, and then any device that actually wants DC converts it back again. Each conversion costs something.
ComfortScrim is a low-voltage DC element, running at 12 to 48 V. Our Multi Zone Power Supply accepts a PV or battery DC input directly. So the heating can be driven straight from the array or the battery, with no inverter in the path at all.
For a household with solar and storage, that is a genuinely different proposition from plugging a 230 V panel heater into a socket.
Why the combination suits how solar actually behaves
Solar generation is intermittent and it peaks in the middle of the day. The classic difficulty is matching that to demand.
Infrared helps in two ways.
It responds in minutes. The element sits millimetres behind the finished surface with very little mass, so it reaches working temperature almost immediately and stops just as fast. That makes it a genuinely dispatchable load: it can follow available generation rather than needing to run on a fixed schedule. A high-mass system such as a wet screed cannot do this.
Warm surfaces hold heat. A heated wall or floor stores some of what you put into it and releases it gradually. Charge the surfaces while the sun is on the roof, and the building carries part of that into the evening.
The efficiency case, stated honestly
You will see infrared marketed as “up to 30% more efficient” and similar. We do not use those numbers, because efficiency at the point of use is already effectively 100% for any electric heater — the resistance element in a fan heater is no less efficient than ours.
The real saving comes from somewhere else: because the heat reaches you as radiation rather than as warm air, most occupants are comfortable at an air temperature two to three degrees lower than a convection system requires. At roughly 6% less heating energy per degree, that is in the order of 12 to 18%. Add proper room-by-room zoning and fast response, and you use less again — by an amount that depends entirely on your building and your habits.
Independent work in Germany, including the IR-Bau research at HTWG Konstanz, has found infrared plus solar to compare well on total cost of ownership against alternatives such as an air-source heat pump with solar, once the capital cost of installation is included. Infrared has no outdoor unit, no refrigerant circuit, no pipework and very little to go wrong; the difference shows up in the capital column rather than the running column.
Where it works best
Poorly insulated older buildings are a case worth flagging. Conventional systems struggle in them because so much heat is lost to air movement and fabric. Warming the solid surfaces directly is both more comfortable and helps with damp, since a warm surface does not reach dew point.
Anywhere with a battery benefits most, because a battery turns intermittent generation into something a heating system can actually schedule against.
Smart controls tie it together. With zoning and a decent controller you can bias heating toward the hours when the array is producing, and let the fabric carry you through the rest.
The honest caveat
Solar will not cover a winter heating load in northern Europe. In December, generation is at its lowest exactly when demand peaks. Anyone telling you a domestic array will heat your house through a British or Irish winter is not being straight with you.
What the combination does deliver is a substantial reduction in imported energy across the shoulder seasons, a heating system that can genuinely chase available generation, and no inverter losses in the path. That is worth having; it is not off-grid heating.
If you want to know what your building would actually need, send us a plan and we will size it — including the DC supply if you are running from panels or a battery.
