Hot Water Coil Installation Advice
- Vampiro
- Member
- Posts: 211
- Joined: Tue. Feb. 07, 2012 11:10 pm
- Location: Transylvania
- Stoker Coal Boiler: Axeman Anderson S260
- Hand Fed Coal Boiler: #45 BAD HWH
- Hand Fed Coal Stove: Harman Mk1
- Coal Size/Type: Anthracite, Pea Coal
- Other Heating: POS gas boiler
Hi all. I will be installing and then plumbing in my hot water coil to the AA-260 (steam setup). Would appreciate any experiences and advice anyone has had.
Here's the parts I'm thinking of.
Copper pipe & fittings, expansion tank, mixing valves & relief valves. Drain valves for the coil. Back flow preventer.
1) I will be plumbing the cold side into the coil.
2) Then will be plumbed to the cold water inlet of the existing gas water heater.
3) Install a back-flow preventer on the cold side to prevent hot water from flowing into the cold water supply.
4) Plumb a bypass, to bypass the water heater in case of a problem, and be able to supply the house with hot water directly from the coil. Install mixing valve on run and also relief valve.
5) Install a mixing valve on the outlet of the hot water heater.
6) Install expansion tank on outlet of water heater piping which will incorporate the bypass piping.
Misc. Install inlet and outlet valves to isolate and drain coil.
Thanks,
Vampiro
Here's the parts I'm thinking of.
Copper pipe & fittings, expansion tank, mixing valves & relief valves. Drain valves for the coil. Back flow preventer.
1) I will be plumbing the cold side into the coil.
2) Then will be plumbed to the cold water inlet of the existing gas water heater.
3) Install a back-flow preventer on the cold side to prevent hot water from flowing into the cold water supply.
4) Plumb a bypass, to bypass the water heater in case of a problem, and be able to supply the house with hot water directly from the coil. Install mixing valve on run and also relief valve.
5) Install a mixing valve on the outlet of the hot water heater.
6) Install expansion tank on outlet of water heater piping which will incorporate the bypass piping.
Misc. Install inlet and outlet valves to isolate and drain coil.
Thanks,
Vampiro
- Rob R.
- Site Moderator
- Posts: 17979
- Joined: Fri. Dec. 28, 2007 4:26 pm
- Location: Chazy, NY
- Stoker Coal Boiler: EFM 520
- Hand Fed Coal Stove: Chubby Jr
Sounds good. Don't forget to pipe a bypass around the coil. You do not want cold water running through the coil when the boiler is not in use, otherwise it will cause condensation and corrosion.
-
- Member
- Posts: 3555
- Joined: Tue. Sep. 04, 2007 10:14 pm
- Location: Dalton, MA
- Stoker Coal Boiler: H.B. Smith 350 Mills boiler/EFM 85R stoker
- Coal Size/Type: Buckwheat/anthracite
I would suggest relying directly on the coil w/tempering valve for whatever seasons you run the 260. Unless you are running a large carwash, or there is something funky about AA coils, a 260 has the power to make abundant DHW in real time.
Mike
Mike
- Vampiro
- Member
- Posts: 211
- Joined: Tue. Feb. 07, 2012 11:10 pm
- Location: Transylvania
- Stoker Coal Boiler: Axeman Anderson S260
- Hand Fed Coal Boiler: #45 BAD HWH
- Hand Fed Coal Stove: Harman Mk1
- Coal Size/Type: Anthracite, Pea Coal
- Other Heating: POS gas boiler
Thanks for the replies and advice.
I've included a diagram that I drew up in paint. Let me know what you all think.
Thanks,
Vampiro
For informational purposes only. No warranty or guarantee expressed or implied. Use at your own risk.
I've included a diagram that I drew up in paint. Let me know what you all think.
Thanks,
Vampiro
For informational purposes only. No warranty or guarantee expressed or implied. Use at your own risk.
Attachments
-
- Member
- Posts: 3555
- Joined: Tue. Sep. 04, 2007 10:14 pm
- Location: Dalton, MA
- Stoker Coal Boiler: H.B. Smith 350 Mills boiler/EFM 85R stoker
- Coal Size/Type: Buckwheat/anthracite
I'm not a piping pro so I'll phrase these as questions:
1. If you insist on running coil output into the gas water heater, would it make sense to put the mixing valve "further down the line" so that the heater gets filled with really hot water and basically never has to run?
2. Is it necessary, or even kosher, to put an expansion tank on a DHW line?
3. Is it necessary to put a PRV on the DHW distribution line (i.e., beyond all of the heat sources)?
Hope this helps.
Mike
1. If you insist on running coil output into the gas water heater, would it make sense to put the mixing valve "further down the line" so that the heater gets filled with really hot water and basically never has to run?
2. Is it necessary, or even kosher, to put an expansion tank on a DHW line?
3. Is it necessary to put a PRV on the DHW distribution line (i.e., beyond all of the heat sources)?
Hope this helps.
Mike
- coaledsweat
- Site Moderator
- Posts: 13763
- Joined: Fri. Oct. 27, 2006 2:05 pm
- Location: Guilford, Connecticut
- Stoker Coal Boiler: Axeman Anderson 260M
- Coal Size/Type: Pea
I've had the coil out of my AA 260. It looks like a mile of really big copper, no wonder it costs a fortune. They are rated for 12 baths IIRC.Pacowy wrote:Unless you are running a large carwash, or there is something funky about AA coils, a 260 has the power to make abundant DHW in real time.
- Vampiro
- Member
- Posts: 211
- Joined: Tue. Feb. 07, 2012 11:10 pm
- Location: Transylvania
- Stoker Coal Boiler: Axeman Anderson S260
- Hand Fed Coal Boiler: #45 BAD HWH
- Hand Fed Coal Stove: Harman Mk1
- Coal Size/Type: Anthracite, Pea Coal
- Other Heating: POS gas boiler
Thanks for the advice Mike.Pacowy wrote:I'm not a piping pro so I'll phrase these as questions:
1. If you insist on running coil output into the gas water heater, would it make sense to put the mixing valve "further down the line" so that the heater gets filled with really hot water and basically never has to run?
A: If you look, there is a bypass around the mixing valve. This way it can supply the water to the tank.
2. Is it necessary, or even kosher, to put an expansion tank on a DHW line?
A: Yes, thermal expansion takes a toll on piping. This will help lead to longer system life.
3. Is it necessary to put a PRV on the DHW distribution line (i.e., beyond all of the heat sources)?
A: I agree with you. On the flip side It can't hurt. If both fail there is still a backup.
Hope this helps.
Mike
-
- Member
- Posts: 3555
- Joined: Tue. Sep. 04, 2007 10:14 pm
- Location: Dalton, MA
- Stoker Coal Boiler: H.B. Smith 350 Mills boiler/EFM 85R stoker
- Coal Size/Type: Buckwheat/anthracite
You're welcome. On the first one, it seems like if you bypass the first mixing valve you'll need a second one downstream of the tank because the water in the tank could get pretty hot, esp. when you're making steam.
Mike
Mike
- SMITTY
- Member
- Posts: 12520
- Joined: Sun. Dec. 11, 2005 12:43 pm
- Location: West-Central Mass
- Stoker Coal Boiler: EFM 520 Highboy
- Coal Size/Type: Rice / Blaschak anthracite
- Other Heating: Oil fired Burnham boiler
My only advice would be to NOT buy from Hilkoil ...
Here's my saga from a few moons ago:
My HW Coils Are Looking Rough After Summer in Damp Basement
Here's my saga from a few moons ago:
My HW Coils Are Looking Rough After Summer in Damp Basement
- Vampiro
- Member
- Posts: 211
- Joined: Tue. Feb. 07, 2012 11:10 pm
- Location: Transylvania
- Stoker Coal Boiler: Axeman Anderson S260
- Hand Fed Coal Boiler: #45 BAD HWH
- Hand Fed Coal Stove: Harman Mk1
- Coal Size/Type: Anthracite, Pea Coal
- Other Heating: POS gas boiler
Thanks again Mike. I see what you are saying. I would add a second mixing valve on the outlet side of the Gas hot water heater, this way it will control the temp either way should it get too high.Pacowy wrote:You're welcome. On the first one, it seems like if you bypass the first mixing valve you'll need a second one downstream of the tank because the water in the tank could get pretty hot, esp. when you're making steam.
Mike
- Vampiro
- Member
- Posts: 211
- Joined: Tue. Feb. 07, 2012 11:10 pm
- Location: Transylvania
- Stoker Coal Boiler: Axeman Anderson S260
- Hand Fed Coal Boiler: #45 BAD HWH
- Hand Fed Coal Stove: Harman Mk1
- Coal Size/Type: Anthracite, Pea Coal
- Other Heating: POS gas boiler
That's true. I also was thinking about the cold water inlet and the dip tube. I believe the dip tubes are plastic. So would I have to pipe the water into one of the taps located on the water heater to prevent melting the dip tube?