Best Of
Re: How can I use 90 F degree water to heat my new house?
It looks to me on casual research that they can handle 90 degrees. Some can go to 120 it appears.
Even if they couldn't, I would consider some kind of bypass loop that recirculated some of the water exiting the heat pump back into the supply in order to moderate/cool the incoming temperature. That nice warm water is too valuable to ignore IMO
Re: Indirect vs reverse indirect
You will not get even close to the recovery that you think if your going to supply 140 degree boiler water to the tank. You can call it a reverse indirect all you want but a turbo maxx is a instantaneous hot water heater. if you dont supply 180 degree water in the tank you are going to reduce the capacity of the domestic hot water. All the numbers are based on 180 degree supply.
The other thing with a Turbo maxx is being an instantaneous water heater the more GPM that flows thru the tank coil the less temperature rise you will have. and you need a big BTU output to keep the boiler temp up. i don't know how your controlling the boilers but the electric is a no and the MOD/CON is considered really small for this application. You can even see that with the BTU recommended from there charts. I hope your staging the boilers and not thinking one will do the job
pedmec
Re: Well... we gotta leak.
larger commercial building especially if it has a lot of bathrooms with flushometers. most of our campus buildings have 4" supply or more.
mattmia2
Re: How can I use 90 F degree water to heat my new house?
I suspect the water may be hotter underground. Even a shallow well may give hot enough water to simplify things.
Re: Augusta Stone Church
@leonz , one would need to check local regulations to see if coal-fired boilers have been outlawed due to air pollution. I know in Baltimore they are prohibited, and have been since the late 1960s.
Re: Question about Erie zone valve
The most common 3/4 sweat Erie is the 7.5 Cv. It has a 17 psi shutoff. You do not have a pump in your system capable of 17 psid. If you did all the valves would be blowing by, all the time.
The static pressure in your system, no pumps running would have the same pressure on both sides of the paddle. The spring tension has the ability to hold 17 psi regardless.
hot_rod
Re: Question about Erie zone valve
First simple test is set it upright on a bench and pour water into it. Does it holdi
The best way is to power the valve open, start flowing water, then remove power, in this example it closed against 20 psi and held bubblefree.
This tests it at actual working condition, with the exception of 180° water
hot_rod
Re: Replacing gas Navien boiler with electric boiler for hydronic heat?
I would not REPLACE the propane boiler. If you want to use electric, ADD an electric unit then you have more options.
JMWHVAC
Re: Augusta Stone Church
@leonz
Im glad that burning coal works for you, but am I to understand that you’re suggesting that as a mechanical contractor I should attempt to sell this as a viable solution to the church? Do you really think that they would want to have to have a coal bin installed, find a coal supplier, have someone be there at least twice a day to shovel coal, and put up with the mess that it would create?
Ironman
Re: Replacing gas Navien boiler with electric boiler for hydronic heat?
I would add the electric and switch between the two when the costs are best. I would not go ripping out a perfectly fine working propane boiler and switching to all electric.
