Best Of
Re: Need more consistent domestic hot water
Hi, Tank type heaters that are glass-lined want to have the anode changed every two to five years and the relief valve should be checked yearly. Flushing out sediment is nice, but usually not too important.
Yours, Larry
Re: Boiler over flow is dry
The glycol evaporates very slowly and has a dye in it so if it is leaking someplace you can see, you will see the dye. If the heat exchanger in the boiler has a slow leak it could be going down the drain with the condensate.
Could be leaking in the slab somewhere too.

Re: Boiler over flow is dry
6 gallons over 5 years is a tiny leak. Ideally it should be fixed but it also is why that feeder system is there. 6 gallons could have evaporated out of that tank over 5 years.
Is there any fluid at the relief valve? The expansion tank should have the precharge checked annually or so and it wouldn't be unusual for it to leak out in 5 years although unless it also failed to seat the pressure should have been at the relief valve set point more or less.

Re: Can I rough plumb a double vanity like this?
Venting needs to be 6" above the flood rim level before going horizontal.
I also dont get the 90s on the ends…
Yes the Tee Wye on the vent is upside down.

Can I rough plumb a double vanity like this?
Many have been so helpful with my bigger discussion on my master bath plumbing, but now a quick question.. didn't want to bury it in the other thread since it can stand alone…
I have a need to put the main drain of a double vanity TOWARD (but not close enough to freeze or anything) an exterior wall. Could I plumb it similar to attached? I'd add a clean out JIC as the line still goes under the floor for about 7 feet before it ties into the 4" main stack.
Can I plumb it like this rather than the traditional double waste T? These are 1.5" PVC waste/vents to be clear.
THANK YOU!

Re: Rinnai Cycling on and off
even know it has been flushed for 3 hours, is it possible that it is overheating? Still yet, go 8th performance data and watch #11. That is the hex temp.. then compare to #2 which is the outlet temp. Should be about 20 degrees difference. If #2 isnt getting to the set temp but overheating on #11 then replace the bypass valve. You can learn to get into performance data by the tech sheet in the pouch on the backside of the cover

Re: How to maintain boiler (oil) after removing coil and adding electric water heater?
I understand that shut off is a bad idea.
I don't have that understanding
PS: I agree completely with your plumber, it is so nice to have those systems separate. If you really want to reduce the operating cost, consider a heat pump water heater and look for state and/or utility incentives
Re: Two pipe vapor system with vapor stat: to cycle or not to cycle?
Doesn't make sense to me that at 11oz you get a 3 :18min run time and at 12oz it will not cycle on pressure.
Re: Air to Water Heat Pumps
One thing to keep in mind, you can always make your own power for AWHP, can't do that with oil or gas.
Utilities have to be careful charging that much for power. At $0.33, PV has a pretty quick ROI even just to offset regular use.

Re: Need more consistent domestic hot water
the key to combi or tankless performance is jeeping the HX descaled. Using the service valves make this an easy task
Its the quality and amount of water that leads to scaling and performance issues. Don’t blame that on the equipment
Phosphate dosers are used in Europe to help eliminate some scaling problems. Various treatment options for hard water are available .
