Best Of
Re: How to delete boiler coil and replace it with a HPWH
This is a good introduction to HPWH and some of the lessons learned so far regarding installation and performance.
HPWH will not perform the same as a gas fired tank. Nor will they perform like a tankless coil or a tankless water heater. They are all unique in the way the operate and provide DHW. It's good to know before you go.
It sounds like you may have a good application. Enough room volume and a cast boiler to grab residual heat from.
Be aware of summer use, the heat needs to come from SOMEWHERE, for the heat pump to "pump"
They discharge cool air, around 45°F. So do't place one next to your bed :)
hot_rod
Re: How to delete boiler coil and replace it with a HPWH
agree 140 is pushing it pretty hard
In Idronics 33 we show 3 options for elevated temperature operation These examples come from A HPWH advisory group that is studying various options. The elevated temperature concept is mainly used to leverage off peak rates
With DHW, it as always comes down to what the customer needs, wants, or is used to. I would guess most homeowners have no idea what their dhw use is
hot_rod
Re: How to delete boiler coil and replace it with a HPWH
Hi, I've been studying this with Gary Klein and indeed, the cold output. done wrong will damage other equipment or cause moldy areas on walls. Even the manufacturers are taking notice of this. Also do make sure that the in and out airflows from the HP do not mix, or you cut performance by pulling in cooler air.
Yours, Larry
Banging Hartford Loop
Hello to all. Has anyone actually encountered a banging Hartford loop ? All of us here were taught about the importance of a short nipple on the Hartford loop. I do strictly residential work and I have seen endless Hartford loops, with nipples of all sizes and lengths. I have never ever encountered a Hartford loop that had any banging noise. On one of the more recent boiler installations that I did, I deliberately installed an excessively long Hartford loop nipple. It was a mixture of convenience and experimentation. It was something like 18 to 24 inches. Not a sound. Zero banging in the Hartford loop or anywhere else for that matter. Would love to hear about everyone else's experiences.
Re: Makeup water causing boiler failure due to thermal shock
Smith (if there still in business) the last 28s I did which was about 8 years ago they stopped using the blend pump as far as I know. They now provide a "return temperature stabilizer". It is a perforated tube of expanded stainless steel with I think a flange on one end. It goes in the 6" tapping in the back section and goes through the top nipple port and runs the length of the boiler. The return water is now piped to the 6" tapping. The return water flows through the "stabilizer" to all sections so I guess it puts the back section under less thermal shock
Re: Adding manifold help needed
Ed, thank you so much for your help. At least we knew what is going on. My husband tried to contact him but he never answer which made us disappointed. He should says something instead of silence
Anyway, im really appreciate your help
Hleight7
Re: Makeup water causing boiler failure due to thermal shock
I do this on every steam boiler that I am service. Just for clarity, I only service residential. Cleaning is part of maintenance. The eight way will break down the sludge. Repeated draining remove the sludge. Adding eight way after the fact, will greatly reduce the sludge going forward.
Re: Makeup water causing boiler failure due to thermal shock
@ethicalpaul - I don't actually know. This was before I got interested in home heating, it was a poorly maintained rental, and I was vaguely recalling that's what the plumber told us (over a decade ago). I think we just came home from work and noticed the house wasn't heating. I don't recall the basement flooding in the same incident.
fentonc