00:00:04.620 properly designed hydronic systems 00:00:06.72000:00:06.730 provide clean energy-efficient comfort 00:00:09.45000:00:09.460 in a versatile package but the 00:00:11.75900:00:11.769 efficiency of a space heating hydronic 00:00:13.47000:00:13.480 system is only as good as the boiler 00:00:15.29900:00:15.309 that powers the whole process if we look 00:00:17.99900:00:18.009 inside a conventional non condensing 00:00:19.85900:00:19.869 boiler we see that combusted gas hits 00:00:21.87000:00:21.880 the heat exchanger which raises the 00:00:23.72900:00:23.739 water temperature before it goes out 00:00:25.17000:00:25.180 into the system however there's also a 00:00:27.74900:00:27.759 lot of extra heat that has sucked out 00:00:29.37000:00:29.380 the exhaust flue with as much as 30 00:00:31.26000:00:31.270 percent of the energy being wasted 00:00:32.81900:00:32.829 replacing the conventional boiler with a 00:00:34.92000:00:34.930 condensing boiler can add efficiency to 00:00:37.08000:00:37.090 any hydronic system condensing boilers 00:00:39.41900:00:39.429 have two heat exchangers the first like 00:00:42.00000:00:42.010 the non condensing boiler is heated by 00:00:43.79900:00:43.809 the gas burner the second captures the 00:00:46.13900:00:46.149 excess exhaust gas heat from the primary 00:00:48.32900:00:48.339 exchanger the heat that is normally 00:00:49.97900:00:49.989 exhausted is waste the high-temperature 00:00:52.11000:00:52.120 water vapour in the exhaust gas 00:00:53.75900:00:53.769 condenses into liquid water releasing a 00:00:56.31000:00:56.320 large amount of heat that is transferred 00:00:57.59900:00:57.609 to the cool water as it first enters 00:00:59.93900:00:59.949 through the secondary heat exchanger the 00:01:01.95000:01:01.960 transfer it pre heats the water in the 00:01:03.59900:01:03.609 system before it's brought up to the 00:01:05.34000:01:05.350 desired temperature by the primary heat 00:01:07.29000:01:07.300 exchanger by preheating the entering 00:01:09.81000:01:09.820 cool water the primary heat exchanger 00:01:11.96900:01:11.979 has to do less work to heat the water to 00:01:14.13000:01:14.140 the final temperature meanwhile the 00:01:16.44000:01:16.450 exhaust gas condensate harmlessly drains 00:01:18.56900:01:18.579 out of the system reusing the exhaust 00:01:21.38900:01:21.399 gas heat results in far lower flue 00:01:23.58000:01:23.590 temperatures than those coming from 00:01:25.02000:01:25.030 conventional boilers and that extra heat 00:01:27.84000:01:27.850 coming out of the flue of conventional 00:01:29.31000:01:29.320 boilers is wasted energy condensing 00:01:32.24900:01:32.259 boiler efficiency ranges from 84 to 98% 00:01:35.58000:01:35.590 depending on conditions new conventional 00:01:38.58000:01:38.590 boilers max out at 82% while older units 00:01:41.94000:01:41.950 can fall as low as 65% 00:01:44.30000:01:44.310 according to the Building Research 00:01:45.95900:01:45.969 Establishment or BR eak in the UK 00:01:48.80000:01:48.810 condensing boilers are more efficient 00:01:50.88000:01:50.890 than standard units in every operating 00:01:52.88900:01:52.899 condition that's a bold statement but 00:01:56.37000:01:56.380 one that makes perfect sense when you 00:01:57.77900:01:57.789 consider the ingenious design of the 00:01:59.58000:01:59.590 condensing boiler 00:02:01.39000:02:01.400 you
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