Best Of
Re: Pick Up Factor- AGAIN
7 section is good for 758 sq feet rads are 772. Your within 3280 over on btus. It will be fine.
I wouldn't give it a second thought.
Re: Simple low-tech (and cost) in-line "residential" water meter?
There might be legal hurdles to using a meter for billing purposes.
ratio
Re: Am I blind? Not seeing the gas shut-off valve.
Shutting the gas off is not necessary to work on a circulator. In fact, it may cause the boiler to lock out on an error code. Just turn the boiler off.
Ironman
Re: Am I blind? Not seeing the gas shut-off valve.
They do have the dirt leg, you can see it in the pictures although it is largely a holdover from manufactured gas which sometimes had a lot of moisture in it. the valve is definitely required in the instructions as well as by most codes.
mattmia2
Re: HVAC in New Construction in 2024
Yes it is, that is total seasonal COP when the heat pump was running:
It also doesn't make sense that they would only look at non EVI units and none were big enough to handle 100% design load. Strange. It also makes the energy use higher as it relies on aux heat too much. Undersized also means a lot more time in defrost which further drops COP.
Please show me the calculation of $1000 hybrid fuel use savings. Short of firing a wood boiler on self harvested wood, I don't see that.
For me, since my operating costs have gone down since switching to heat pump, adding in a fuel burner would only add cost.
Kaos
Re: HVAC in New Construction in 2024
That table is full system COP including outdoor and indoor unit loads. A bad install can definitely hurt efficiency, but that is the case with any setup regardless of furnace/boiler/heat pump.
Anything duel fuel only makes sense if you already have the equipment. When you do the math on cost, the savings are in the order tens of dollars per year, so ROI of installing any extra equipment is never.
Kaos
Re: Boiler plumbing questions
I'm not sure how many folks have the ability or $$ to run 2" piping throughout their homes. I'm guessing in the $5- 6.00 per foot for schedule 40 steel pipe. Plus insulation?
In log homes it may not be easy to hide or cover large piping.
hot_rod
Re: Propane In-Floor Heat Operating Costs
Run time is completely irrelevant here and you can disregard that advice. You simply need your heat loss and your heating degree days. You can get the heating degree days in 1 minute from Google, but it’ll be slightly more work to get the heat loss.
Re: Propane In-Floor Heat Operating Costs
Perform a heat loss calc and combine that figure with your actual HDD, and it'll give you your annual BTU needs. Divide that BTU number by about 84,000 (92% efficiency) and you have your gallons required. Always a boiler, never a tankless. Whoever told you the run time thing needs to be completely disregarded.
GroundUp