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Another revolution in the method of heat distribution

Modern heating systems must meet the growing demands in terms of thermal comfort. In smart homes of the future, the underfloor heating currently installed more and more often by itself will not work due to long reaction time. Just a small amount of heat energy is sufficient to heat homes built today, so for most of the day and most of the heating season the system does not have to heat at all in a warm, well-accumulating house. All heat yields are taken advantage of. When the desired interior temperature is reached, the heating system should stop the heating. The base temperature of a warm, well-accumulating house does not change in a short period of time. Although it is true that short-term increase in air temperature is often desirable, soon after the cessation of heating the interior air temperature returns to the starting temperature. This is an ability of self-adjustment of the interior temperature. With only underfloor heating, a quick, short-term increase in air temperature will not be possible. For this purpose, you need to have additional  radiators  or trench heaters.
Trench heater REGULUS-system CANAL
Is it possible to combine a radiator system and underfloor heating in a single heat distribution system?
There is an opinion that mixed heating using radiators and underfloor heating is a bad choice. It is assumed that these systems must work at different supply temperatures. Meanwhile, in homes built in accordance with modern standards, there are no obstacles preventing the supply of radiators and underfloor heating from a common manifold with water at the same temperature. In this configuration, underfloor heating, as the poorly controllable component, is installed only on the exposed parts of floors, in passageways, bathrooms, etc., using it to cover 20-40% of the required heat output, providing the warmth-loving household members with the warm floor effect. The price of such an underfloor heating system is inevitably much lower. The rest of the required heat output is provided by radiators that may have a decorative design and be colour-matched to the interior. In this configuration, the amount of heat emitted will always correspond to the actual heating needs of the household members, taking into account all, even the most volatile and unexpected weather situations, both now and in the future. Whether only one of the heat distribution routes is used, or both at once, depends on the choice of the user and the current heating needs. 
Central heating radiator REGULUS-system SOLLARIUS PLAN
Optimally working central heating system
A central heating system consists of a factory, or the heat source, and its "market", or the home. Heat should optimally produces and optimally stored (not always necessarily), and optimally dosed. Each of these stages should be analysed separately, because it is possible to produce heat optimally, at the same time storing or dosing it not in an optimal way. Unjustified losses may occur at each stage. Most users focus on optimising the heat source, losing sight the optimisation of the use of heat. Too little or too much heat is not good, as well as delivering it at the wrong time. Optimal heat production means that the heat source operates at maximum efficiency. Sometimes, therefore, there is a need for storing heat - in a buffer tank - between its production and its distribution. Optimal distribution consists of, among other things, meeting even the most sophisticated heating needs of household members, which are constantly evolving. The year-round isothermy offered by underfloor heating nowadays is becoming insufficient. Radiators will return, though not in the form we know today.

Application of trench heater REGULUS-system CANAL

When to use a heat buffer?

If, despite zero heating needs, the heat source continues to produce it and its production is controllable in a relatively small way (solid fuel boilers) or it is produced consciously because of the lower price of the heat medium, it should be optimally stored. Also, every time you turn off the heat emitters, and heat is still being produced, its stream should be redirected to the buffer tank, and not "to the stack" ... A heated buffer tank may hold such a quantity of stored heat, that it is possible to heat the building without running  the boiler.

Calorific value of the fuel is utilised to the maximum. If you will thus be able to reduce the number of days during which the solid fuel boiler is working  during the heating season, by a few or several dozen, the time savings are obvious. Also, the amount of fuel will decrease, by being burnt in an optimal way, and the life of the optimally operated boiler and chimney system will increase. There will also be other indirect benefits, e.g. those associated with lower emission of soot into the environment. Directing all of the heat generated, despite the lack of heating needs, directly to underfloor heating means wasting it recklessly. The job of the radiators, including floor radiators, is also not to buffer the excess capacity of the boiler. The boiler + a large buffer tank will enable the use of any burning technique, any fuel, while a low-inertia radiator system will allow precise dosage of heat. An effect of a warm floor will complete the thermal comfort.