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New boiler install G115 and controls questions
I am finally getting our old leaking Burnham V7 replaced with a Buderus G115 (yay!)
Our installer has done a few things that I'd like clarification on.
1: The circulation pumps:
On most installations that I have seen, the TACO 007 pumps were set up on the returns, pulling cold water out of the baseboard loops and drawing the hot up as a result.
Our installer set up the pumps on the *supply*, pumping hot into the loops.
Will this cause our pumps to wear out faster? Do they care? And, do they have a "correct mounting orientation? Some are mounted horizontally, some vertically.
2: On our burnham, the supply and return had a pipe running between them, which i guess caused it to heat the manifold faster or something.
On the GB142 I have at my other property, the manifold *is* a loop, with its own multi-speed circulator
Here, the installer did not install any loop directly on the manifold, and the circulation happens only when one of the heating or DHW loops is calling for heat.
Is this correct for G115?
3: Our installer put in a Fuel Smart "Hydrostat" aquastat that apparently has algorithms and programming to calculate how long a zone is calling for heat, and it will ramp up the target boiler temperature based on that algorithm. No outdoor reset sensor, no indoor reset sensor.
Any idea how much of an efficiency change I would see if I upgraded to a 2107 or tekmar system with indoor/outdoor reset?
Also, has anyone used one of these with a radiant loop? I want the algorithm to be bypassed when running radiant obviously, as the radiant loop might call for heat for hours.
As a note, my experience with outdoor reset hasn't been great... I have a Tekmar 260 outdoor reset control that i used with the V7, but saw basically no efficiency change because we used to have an air handler that required a minimum of about 170 degrees to put out any useful heat... we've gotten rid of the air handler and are now just baseboard + radiant.
At the other property, when I had outdoor reset added to the GB142, I saw heating bills go up. Possibly due to older inefficient baseboard that wasn't getting hot enough to convect.