4tees wrote:Great job! When will you begin marketing "Gene's external dhw coil"?
Did you put together a parts list and source?
7 - 3/4" Copper Sweat T's
2 - 3/4" Brass Sweat Unions
3 - 3/4" Copper Sweat 90's
1 - 3/4" Copper Sweat 45
3 - 3/4" Copper Sweat to NPT Female adapter
4 - 3/4" Copper Sweat to NPT Male adapter
1 - 3/4" male to 1/4" female reducing bushing
1 - 1/4" automatic air vent
1 - 006 series Taco Bronze pump (Grainger)
1 - 9' cord (for pump)
1 - 3/4" Gate valve Bronze
2 - 10' X 3/4" L copper pipe
2 - 3/4" Brass T's NPT
2 - 3/4" Brass drain valves
1 - 3/4" X 3" brass nipple
2 - 3/4" close nipple
2 - Panel Mount Thermometers - Grainger 5XL18
3 - lengths 3/4" pipe insulation
3 - 3' lengths of fin tube.
This is what is needed for the coil to tempering tank installation, not getting your cold water supply to the tank and the tempered water to your already existing water heating source.
Why the expansion tank on the cold water inlet?
I knew there would be expansion due to the fact when you expel the hot water supply and replace it with cold water would expand over time, I knew the tank is needed. The expansion tank is always located on the cold water inlet on a domestic water heating application.
What made you decide to go with the pump vs thermosyphon?
The reason for the pump is that the location from the coil to tempering tank is around 10' in pipe length, I am not a fan on piping being "pitched", and this will also serve when I use this same system for a solar panel that I am going to use during the summer months.
Is your pump set up to run continously? How is that wired?
Continuous for now. Wired with a 14 gage cord to a outlet.
Have you been tracking input/output temps throughout the day? ie before/after morning showers, etc. How low do temps go after morning hot water usage?
I have, it depends on how hard the stove is running. It is 13 outside so the stove is really going and so my temperatures this morning were in the 120's range, after two showers we were in the low 90's
It was milder out the other day and I observed temperatures in the high 80's
I have been thinking about the hykoil since I got my Hyfire last year but really don't want to cut those holes in the side of the stove. I have a huge boiler for my steam heating system that heats our hot water. Have not run boiler for heating yet this year. Hope to be able to bypass the boiler completely and save that fuel oil.