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Joined on November 2, 2010

Last Post on April 18, 2014

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same issue

@ April 18, 2014 12:45 AM in Roll out switch issue

Good morning Tim,

I have this issue on a dry base Smith boiler. Constant burning the flame roll out fuses and occasionally the thermocouple too.

Any way you can give me a few leads on A, finding the correctly rated roll out switch; and B,more info on bblocking the draft hood and adding a barometric?

Thanks in advance!


@ April 17, 2014 12:12 PM in Happy Passover

Thanks Terry. A few days of vocation and then back to work!


@ April 14, 2014 8:42 AM in Can a Circulator Pump Past a Stopped Downstream Pump?

I wouldn't be surprised if there is a grant for ecm circulator generators before ashps....

Great work

@ April 14, 2014 8:31 AM in What do you think of when somebody says Hydronics?

Great work Harvey!

VFD is always fun and can usually replace the typical shuttle pumps. Many applications don't have a need for slowing the flow, however here the benefits are clear!

In addition, in am certain the cows appreciate the warm water!

Thanks for sharing.


@ March 25, 2014 8:29 PM in Radiant Wall - Ceiling -Floor Assistance

Thanks for the lead.


@ March 25, 2014 8:27 PM in Radiant Wall - Ceiling -Floor Assistance

Barrowed from Where they barrowed it is beyond me.

Mark, so I guess I have all the math I need as far as how many sq ft of wall space. How about calculating the driving temp of the water behind sheetrock? Chances are we will have way more wall coverage then needed, and boom we are in to efficiency land for the boiler.

I tried to get him to do radiant ceilings on the first floor but he got cold feet (pun intended) when he heard the cost of warmboard.

Radiant Wall - Ceiling -Floor Assistance

@ March 24, 2014 1:02 PM in Radiant Wall - Ceiling -Floor Assistance

Good afternoon wallies,

Doing some design work for a house we are working on next week.

House will have cast iron radiators oversized for lower water temps. Three rooms require radiant to work with decor and lack of wall space.
Front walk in, kids bathroom, & kitchen.

Front walk in is 20 sq ft with a load of roughly 900btu. For this we are contemplating ceiling radiant with possibly adding floor radiant too.

Main kids bathroom 40 sq ft, 1100btu.

Kitchen, still awaiting counter and cabinet layout.

Questions: ADS software wont work on my computer so limited to mathematics.
I think the front entrance can be heated radiantly.
For the bathroom we would like to do wall radiant (maybe floor too in the mud) with plates like the attached photo. Cant use Roth panel as the one inch loss in wall thickness will place the tub drain over a 2x12 beam. Wall will be spray foamed so carving out a small channel for the plates would work well.

Input would be helpful as I already spent much time searching and finding factors of .7-.8 btu per sq ft for tw-tr from the idronics6.

Lastly, which plates are of heavy gauge for the wall? The only plates I have used were Uponur extruded.

Thanks in advance.

Rinnai & MCC

@ March 23, 2014 9:46 PM in How should I insulate this tank?

Get the real time data of the water pressure and gpm of the spray heads then add for some more (in the event they use all six).
Rinnais with the MCC control can cook the water to 180*f
Your limiting factor will be reusing what you have there.


@ March 19, 2014 1:33 AM in It's just air!

Great class indeed!

Low-High temp hybrid?

@ March 18, 2014 11:19 PM in How would you do this?

At least this job you know its free upfront.

How about a high and low temp hybrid system? Have the two boilers feed a buffer tank. Use a condensing boiler of your choice with a high temp wet base boiler as the high temp source. Control it properly and you will have efficiency, redundancy and have your experimentation.


@ March 12, 2014 6:25 PM in Rinnai RH180 or 100 Gallon Atmospheric?

Its a blend of old and new money. They're careful how they spend it, but when they want something (hot water) and they trust in you to deliver it, they don't mind spending

I have had homes with water blending in the walls, thankfully its not the norm. Sometimes its a bad check valve on the cold inlet to the heater and the recirc pump is the issue. Other times it has been thermostatics. I am actually going back to a home that was plagued with bad thermostatic check valves to pull apart another shower trim for inspection. The equipment is a 399mbh boiler and 119 gal dhw tank.


@ March 11, 2014 11:28 AM in Rinnai RH180 or 100 Gallon Atmospheric?

The high end clients wont settle for anything under 4-5 gpm! They want to feel it pour! Some have so much water the drain cant handle it. Some have truff drains with 2inch drain pipe.
One client has three shower bodies in one shower. Another shower I did used the 24in Kohler shower tile.
How often do they need all the water at once? Infrequent to frequent depending on the home. Same goes to their high end four door sports cars with close to 500hp from the factory. How often do they use it? Less often then they use all the hot water up.


@ March 9, 2014 7:41 PM in Rinnai RH180 or 100 Gallon Atmospheric?

Not too hard to believe when large homes are used and many children take long showers, washing machine loads, and running sinks simultaneously.
A client with an eighty gallon indirect and large btu boiler complained last week of running low so I went over to test. Rain shower, ran a bath, used a sink, etc and after an hour it started running warm. Tank is kept at 160 and has a mixing valve to temper. Of course I over exhausted the system intentionally.

On another note, four showers on a RU98 at once? What temp is the dt across the hx and what flow from the shower heads? Thats surely not high flow heads.


@ March 6, 2014 1:51 PM in Rinnai RH180 or 100 Gallon Atmospheric?

Will email you some closeups when I return to the job site shortly.


@ March 6, 2014 1:50 PM in Rinnai RH180 or 100 Gallon Atmospheric?

Thanks for the tip. There is a filter on the main that one of the employees changes regularly. I have room on the piping to add a filter if necessary.

Rinnai plus storage

@ March 5, 2014 10:28 PM in Rinnai RH180 or 100 Gallon Atmospheric?

Just wanted to chime in. Installed a Rinnai RU98i and a storage tank for a restaurant yesterday. Set up the system so that even if the storage tank is cold, so long as the draw out of a faucet, sprayer or appliance is under what the tankless can supply, they get the hot water from the tankless and not the cold from the tank.
The employees of the restaurant were utterly surprised how the storage tank was full of cold water from filling the system, yet two minutes later they were getting steaming water at the sink sprayers. Job turned out real nice.


@ March 5, 2014 10:22 PM in Rinnai RH180 or 100 Gallon Atmospheric?

To date haven't been happy with these. Actually ended up taking a few out and installing oversized indirects to handle dump load and large first hour ratings.


@ March 5, 2014 10:19 PM in Rinnai RH180 or 100 Gallon Atmospheric?

Current tank is already jacked up on the thermostat by the home owner. He put the job on hold till he decides what he wants.

Air to Water

@ March 2, 2014 1:49 AM in geothermal vs. airsource

Good conversation going here. Curious to read the outcome if you ever go through with the install.

Have you looked into the Daikin Altherma? Less pumping loss, no need for glycol, no worry that the ground will dry up, etc. There may be competitors to the Altherma, however I have not looked into it.


@ February 28, 2014 4:00 AM in Rinnai RH180 or 100 Gallon Atmospheric?

Good morning Larry W,

Unsure what shower heat exchangers are.


@ February 26, 2014 12:49 PM in Rinnai RH180 or 100 Gallon Atmospheric?

Totally off target icesailor. Feel free to contact me.

Btw thanks for telling me about the direct fit mixing valve. Used it on a 50 gallon yesterday where a high recovery was needed but didnt fit due to an extremely small mechanical room.


@ February 23, 2014 7:12 PM in Rinnai RH180 or 100 Gallon Atmospheric?

Tankless tied to a tank is fine. Tankless on its own not fine. Just take it as that, or feel free to contact me off line to discuss.

Regardless need dump load, so a tank and tankless would be great.
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