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Remove tankless HW from boiler? salty 05-11-2008
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Posted by on May 11, 2008, 9:04 am
There is a boiler in one wing of a home I own that has a tankless water heater.
This wing of the house is closed off and not occupied. I only run the boiler
enough to keep pipes from freezing in winter. I would like to disconnect the
domestic hot water since it sometimes makes the boiler run even though there is
no use for domestic HW in that part of the house. Can I simply cap off the cold
water supply to the exchanger, drain it, and forget about it, or do I need to
remove the coil?



Posted by RBM on May 11, 2008, 9:37 am

> There is a boiler in one wing of a home I own that has a tankless water
> heater.
> This wing of the house is closed off and not occupied. I only run the
> boiler
> enough to keep pipes from freezing in winter. I would like to disconnect
> the
> domestic hot water since it sometimes makes the boiler run even though
> there is
> no use for domestic HW in that part of the house. Can I simply cap off the
> cold
> water supply to the exchanger, drain it, and forget about it, or do I need
> to
> remove the coil?

You could do any or all of the above, but it won't stop the boiler from
running. The easiest thing to do is shut the power to the boiler when the
heating season is over. The other thing you can do is turn down the aquastat
that controls the domestic hot water. This is sometimes a separate device
piped into the boiler's water jacket, and on newer boilers it's often a
triple aquastat relay, which will have a low temperature cut in and a high
temperature cutout within one box. In either case, just turn down the cut in
control as far as it will go, and the boiler shouldn't fire unless a
thermostat calls for heat
>
>



Posted by on May 11, 2008, 9:53 am

>
>> There is a boiler in one wing of a home I own that has a tankless water
>> heater.
>> This wing of the house is closed off and not occupied. I only run the
>> boiler
>> enough to keep pipes from freezing in winter. I would like to disconnect
>> the
>> domestic hot water since it sometimes makes the boiler run even though
>> there is
>> no use for domestic HW in that part of the house. Can I simply cap off the
>> cold
>> water supply to the exchanger, drain it, and forget about it, or do I need
>> to
>> remove the coil?
>
>You could do any or all of the above, but it won't stop the boiler from
>running. The easiest thing to do is shut the power to the boiler when the
>heating season is over. The other thing you can do is turn down the aquastat
>that controls the domestic hot water. This is sometimes a separate device
>piped into the boiler's water jacket, and on newer boilers it's often a
>triple aquastat relay, which will have a low temperature cut in and a high
>temperature cutout within one box. In either case, just turn down the cut in
>control as far as it will go, and the boiler shouldn't fire unless a
>thermostat calls for heat
>>
>>
>

Thanks. Are you saying that turning that control down all the way won't affect
the boiler functions of heating of the house? That almost seems too easy. I
thought that control would affect the water temp to the baseboard heating
circuit as well.

I do shut down the boiler as soon as danger of a hard freeze is over. All the
upper floor's domestic water plumbing and baseboards are empty, so I only need
to heat the basement slightly to avoid damage to the foundation. I'm just trying
to save as much oil out there as possible, and don't want to use any oil for
heating domestic hot water that nobody needs.





Posted by RBM on May 11, 2008, 10:15 am

>
>>
>>> There is a boiler in one wing of a home I own that has a tankless water
>>> heater.
>>> This wing of the house is closed off and not occupied. I only run the
>>> boiler
>>> enough to keep pipes from freezing in winter. I would like to disconnect
>>> the
>>> domestic hot water since it sometimes makes the boiler run even though
>>> there is
>>> no use for domestic HW in that part of the house. Can I simply cap off
>>> the
>>> cold
>>> water supply to the exchanger, drain it, and forget about it, or do I
>>> need
>>> to
>>> remove the coil?
>>
>>You could do any or all of the above, but it won't stop the boiler from
>>running. The easiest thing to do is shut the power to the boiler when the
>>heating season is over. The other thing you can do is turn down the
>>aquastat
>>that controls the domestic hot water. This is sometimes a separate device
>>piped into the boiler's water jacket, and on newer boilers it's often a
>>triple aquastat relay, which will have a low temperature cut in and a high
>>temperature cutout within one box. In either case, just turn down the cut
>>in
>>control as far as it will go, and the boiler shouldn't fire unless a
>>thermostat calls for heat
>>>
>>>
>>
>
> Thanks. Are you saying that turning that control down all the way won't
> affect
> the boiler functions of heating of the house? That almost seems too easy.
> I
> thought that control would affect the water temp to the baseboard heating
> circuit as well.
>
> I do shut down the boiler as soon as danger of a hard freeze is over. All
> the
> upper floor's domestic water plumbing and baseboards are empty, so I only
> need
> to heat the basement slightly to avoid damage to the foundation. I'm just
> trying
> to save as much oil out there as possible, and don't want to use any oil
> for
> heating domestic hot water that nobody needs.

Without knowing the controls you have on the boiler, I can't say for
certain, but a typical modern boiler equipped with domestic coil, will have
a triple aquastat relay, and the low temperature cut in is only to maintain
tank temperature for the coil. The heating thermostat(s) will shunt the "T
T" terminals in the relay and fire the boiler overriding the low temp cut
in, and stay fired until the boiler reaches the high limit, or the zone
calling for heat is satisfied
>
>
>
>



Posted by on May 11, 2008, 10:25 am

>
>>
>>>
>>>> There is a boiler in one wing of a home I own that has a tankless water
>>>> heater.
>>>> This wing of the house is closed off and not occupied. I only run the
>>>> boiler
>>>> enough to keep pipes from freezing in winter. I would like to disconnect
>>>> the
>>>> domestic hot water since it sometimes makes the boiler run even though
>>>> there is
>>>> no use for domestic HW in that part of the house. Can I simply cap off
>>>> the
>>>> cold
>>>> water supply to the exchanger, drain it, and forget about it, or do I
>>>> need
>>>> to
>>>> remove the coil?
>>>
>>>You could do any or all of the above, but it won't stop the boiler from
>>>running. The easiest thing to do is shut the power to the boiler when the
>>>heating season is over. The other thing you can do is turn down the
>>>aquastat
>>>that controls the domestic hot water. This is sometimes a separate device
>>>piped into the boiler's water jacket, and on newer boilers it's often a
>>>triple aquastat relay, which will have a low temperature cut in and a high
>>>temperature cutout within one box. In either case, just turn down the cut
>>>in
>>>control as far as it will go, and the boiler shouldn't fire unless a
>>>thermostat calls for heat
>>>>
>>>>
>>>
>>
>> Thanks. Are you saying that turning that control down all the way won't
>> affect
>> the boiler functions of heating of the house? That almost seems too easy.
>> I
>> thought that control would affect the water temp to the baseboard heating
>> circuit as well.
>>
>> I do shut down the boiler as soon as danger of a hard freeze is over. All
>> the
>> upper floor's domestic water plumbing and baseboards are empty, so I only
>> need
>> to heat the basement slightly to avoid damage to the foundation. I'm just
>> trying
>> to save as much oil out there as possible, and don't want to use any oil
>> for
>> heating domestic hot water that nobody needs.
>
>Without knowing the controls you have on the boiler, I can't say for
>certain, but a typical modern boiler equipped with domestic coil, will have
>a triple aquastat relay, and the low temperature cut in is only to maintain
>tank temperature for the coil. The heating thermostat(s) will shunt the "T
>T" terminals in the relay and fire the boiler overriding the low temp cut
>in, and stay fired until the boiler reaches the high limit, or the zone
>calling for heat is satisfied
>>

Thanks very much. The boiler is only a year old, so I imagine the controls are
what you are describing. To be safe, I'll try changing the settings, and wait
around to make sure everyting is okay before walking away from it.



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