Have you ever used these Doitall?
http://heating.danfoss.com/PCMPDF/VDCHA102_Restrictors.pdf[/QUOTE]
Not used either of those.
Have used tongue tees.
Injector tees, which is similar to the union in your link.
And the normal Pitcher tees.
I agree that is neigh impossible to keep a system of for instance 10 rads at exactly 20 degrees, but if you carefully balance each rad, you can get reasonably close.
This does assume that each rad is reasonably accurately sized for the room it is in, thereby avoiding the situation that 8 out of 10 rads are off for prolonged periods of time whilst the boiler is still running to heat up the other 2.
I'd say it is reasonable to expect that in a correctly designed heating system, most of the time that the boiler is actually on, at least half the rads are open.
Have you ever used these Doitall?
http://heating.danfoss.com/PCMPDF/VDCHA102_Restrictors.pdf[/QUOTE]
Not used either of those.
Have used tongue tees.
Injector tees, which is similar to the union in your link.
And the normal Pitcher tees.
Would these not be a much better option than any of the above.....?
http://ogrevanje.danfoss.com/PCMPDF/VHS-E_one-pipe_VD53E202.pdf
There isn't any, but I'm open to your opinion.
It goes back to that old age theory, that a boiler that is undersized and has to work for a living is far more efficient than one which is oversized.
Modern boilers modulate down according to the return temperature, think about it.
There isn't any, but I'm open to your opinion.
1 - The radiator passes its cooler water into the return thus minimising temperature dilution to consecutive radiators.
2 - With a 2 pipe system the water is not only pumped around the system but through the radiators also giving them a much faster heat up period.
3 - Balancing is simplified
4 - Radiator sizing calculations are simplified.
5 - TRV's for 2 pipe systems are easily available and much cheaper than 1 pipe TRV's.
6 - A one pipe system cannot be used with convector radiators.
Whats complicated about a radiator valve with a by pass incorporated?
4. Calculating rad sizes is exactly the same
2. Program the boiler to come on 10 mins sooner, they're a lot of advantage in a slower heat up, especially as it reduces boiler cycling.
6 - A one pipe system cannot be used with convector radiators.
err yes it can
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