Although there are many new patents around at the moment, pulsating gas heating is quite common in home gas appliances. It is simply the idea that in place of streaming the gas at a constant rate a very fast pulsing takes place. It turns out this is more efficient and has other advantages, like keeping the heat exchanger cleaner for longer.
Many of the modern and efficient gas central heating boilers make use of this pulsing advantage in their products. What you need to look for is the most efficient gas units.
These highly efficient modern boilers use a whole bag of tricks to get to the efficiency figures of ninety percent and upwards. Remember that only a few years ago even the best gas water heater was only about 65% efficient! For example, new units do not allow the exhaust gases to go to waste, but make use of them in the heating process.
So to get value in residential gas heating, you should search out the boiler with top efficiency ratings. The other thing you should do is size appropriately. There is no point buying a unit that meets more than your needs, but there is nothing worse than a unit that does not keep your water or your house hot. It is worth the time to do a proper usage survey before splashing out. While you are at it, do any of those low cost-high value jobs that you have been putting off. Better insulation, pipe lagging and so will really improve your home heating efficiency.