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Old 02-10-2014, 09:47 AM   #1
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Eliminating Tankless DHW


The home I purchased recently had a new Smith steam boiler installed with tankless DHW. I am going to replace the DWH with an electric unit and eliminate the tankless/oil hot water.

Not sure where to start or how involved it will be. I have identified the cold water supply and the hot water piping as well. There appears to be a mixing valve of some sort as well.

Based on these pics can someone experienced with this offer suggestions on what necessary steps need to be taken to make this conversion?
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Old 02-10-2014, 12:24 PM   #2
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Eliminating Tankless DHW


Ayuh,.... There's nothin' to see in yer pictures, they're way to dark,...
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Old 02-10-2014, 01:06 PM   #3
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Eliminating Tankless DHW


Is this better?? This is the cold supply and the hot return out of the boiler. Also I believe its the mixing valve??? The box has a t-stat wire running to it and is set a 180 degrees
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Old 02-10-2014, 03:36 PM   #4
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Eliminating Tankless DHW


Why not just add a hot water storage tank?

Last edited by Ishmael; 02-10-2014 at 03:54 PM.
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Old 02-11-2014, 03:41 PM   #5
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Eliminating Tankless DHW


I am. An 80 gallon electric smart tank. Just paid 3.88/gallon for oil. Too much to heat DHW. Should be cheaper with electric.
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Old 02-11-2014, 04:32 PM   #6
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Eliminating Tankless DHW


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Originally Posted by johnpma View Post
Too much to heat DHW. Should be cheaper with electric.
In summer? Sure. Not so much in winter.

Use the electric heater in the warmer months
Add a couple of valves to direct the cold incoming and the hot outgoing.
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Old 02-12-2014, 06:31 AM   #7
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Eliminating Tankless DHW


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I am. An 80 gallon electric smart tank. Just paid 3.88/gallon for oil. Too much to heat DHW. Should be cheaper with electric.
I see. I assumed the motivation was that the tankless wasn't providing enough hot water; rather than cost. But to clarify, your plan is to install a water heater; whereas I suggested a hot water storage tank - two different animals. A storage tank has no means of heating the water directly; it relies on the tankless to fill it with hot water and maintain the temperature.
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Old 02-12-2014, 07:05 AM   #8
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Eliminating Tankless DHW


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In summer? Sure. Not so much in winter.

Use the electric heater in the warmer months
Add a couple of valves to direct the cold incoming and the hot outgoing.
We now heat with wood so the only time the boiler fires is if we have a burnout and the temp in the home goes below 55.
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Old 02-12-2014, 07:08 AM   #9
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Eliminating Tankless DHW


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I see. I assumed the motivation was that the tankless wasn't providing enough hot water; rather than cost. But to clarify, your plan is to install a water heater; whereas I suggested a hot water storage tank - two different animals. A storage tank has no means of heating the water directly; it relies on the tankless to fill it with hot water and maintain the temperature.
I see. Yes I want to eliminate useage of the tankless just not sure what I have to do??? Do I have to turn the aquastat down and just cut the plumbing and re-rote it to the new DHW tank? Cap the tankless lines ect...the boiler heats water on demand so in theory if there is never a call for hot water it should never try to heat it I guess.
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Old 02-12-2014, 07:17 AM   #10
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Eliminating Tankless DHW


Quote:
Originally Posted by johnpma View Post
I see. Yes I want to eliminate useage of the tankless just not sure what I have to do??? Do I have to turn the aquastat down and just cut the plumbing and re-rote it to the new DHW tank? Cap the tankless lines ect...the boiler heats water on demand so in theory if there is never a call for hot water it should never try to heat it I guess.
Ayuh,.... Just by-pass the tankless unit, 'n plumb in the tank in it's place,...

There shouldn't be any reason to alter the controls on the boiler,...
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Old 02-12-2014, 07:33 AM   #11
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Eliminating Tankless DHW


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Ayuh,.... Just by-pass the tankless unit, 'n plumb in the tank in it's place,...

There shouldn't be any reason to alter the controls on the boiler,...
bypass meaning install a couple valves to shut the supply and return off to, and from the boiler?
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Old 02-12-2014, 09:12 AM   #12
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Eliminating Tankless DHW


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Originally Posted by johnpma View Post
bypass meaning install a couple valves to shut the supply and return off to, and from the boiler?
Ayuh,.... As in all things, there's many ways to get where ya wanta be,....

You Could;...
Cut the heat exchanger out of the plumbin' all together, 'n plumb the new heater into those cuts,...
Or,...
You Could;....
Plumb it with Tee fittin's, 'n valves, so's ya could run either system, just by turnin' the valves to alter the flow, though either heater ya want in service,....
Or,...
You Could;....
...............................................

It depends on what ya want, 'n where things fall together,.....
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Old 02-12-2014, 09:21 AM   #13
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Eliminating Tankless DHW


Thanks for your help Bondo And my dad loves Moxie

If I choose to cut the boiler heat exchanger out of the loop should I cap those pipes or doesn't it matter? I looked at the boiler diagram and it looks like it is completely separate from any water that would supply the boiler to make steam.
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Old 02-12-2014, 10:45 AM   #14
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Eliminating Tankless DHW


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Thanks for your help Bondo And my dad loves Moxie

If I choose to cut the boiler heat exchanger out of the loop should I cap those pipes or doesn't it matter? I looked at the boiler diagram and it looks like it is completely separate from any water that would supply the boiler to make steam.
Ayuh,.... Cool,... I haveta drag Moxie, by the case, from New Hampshire,...
Only place in Ny that I've seen it is in a few stores, Darn few stores, up 'round Plattsburg way,...
It's 1 of my ole Maineiac things, I just can't live without,....

As for the DWCoil,... Don't cap it,....
It could explode/ rupture from heated trapped water,...

'n the mixin' valve ya mentioned, it can also be deleted, as yer new heater will have it's own temp control,...
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