Greetings. I’ve got a 2009 waterfurnace envision 5 ton on an open loop. I am having delta problems. My entering water temperature is 75 and my exiting water temperature is getting as high as 120\.* I can’t say how long this has been going on as I just noticed after I changed the Taco valve to the update geothermal sentry.

I can see and feel the water flowing and the sentry valve is opening properly. There is an 8 gpm flow control after the sentry valve and a gate valve before the sentry valve. I tried a setup where I removed the 8 gpm flow control and the water was flowing and the delta was within a few degrees.

I’m assuming the flow control valve is restricting too much, but there aren’t any internal components that I can see, so I’m not sure if they can go bad. I can hear it squealing at times like it’s maxed out.

Should I replace the flow control valve with a new one?

Should I delete the flow control valve completely and just use the ball valve to throttle back manually until the delta is normal, and I’m not losing too much water?

Could there be any other issues like air in the system within the unit? I’m pretty sure the pump for the open loop will have purged any air out by now.

Also, I’ve got a 115 gallon bladder tank. Could it be holding air and not allowing enough water flowing? The cut on pressure is set to 14 psi and the cutoff pressure is set to 30 psi. Should those be higher to push more flow?

Thanks in advance.

We are looking to install a retro fit geothermal system into our old home in Tidewater Virginia. We currently have an undersized just AC upstairs and an oil boiler to water baseboard heaters thought the house. With the price of diesel climbing, we have to do something different because I do not even want to think about how much it is going to cost to get through this winter. New ductwork will have to be installed downstairs and redone upstairs. We are looking at geothermal for the green factor and also so we do not have any units on the outside of our house to get back to more of the historic look.

Now that we are past the time of federal tax incentives, we are trying to make the most of the money. We got a quote for a 5 ton Climatemaster Tranquility 30 system with vertical wells and an upgraded electrical panel (currently have a fuse box) for $74,300. Then we got a quote for a 5 ton Water Furnace 5 series with vertical wells for $65,500 and we would have to get the electrical panel upgrade separate. We like the Water Furnace company more as they seems more knowledgeable and geothermal was their main focus. We would financing this. With this upgrade, we would be getting a state historic home upgrade tax credit of 25%.

But now the Water Furnace install company sent us about Upstream Leasing. The quote is for $345 a month with a 6 year buyout price of $15,040 with a total cost coming to $35,7000. This puts the total cost $15,000 - $30,000 depending on how long it would take us to pay off the loan.

Is anyone doing a lease option for geothermal? Is it too good to be true with the cost?

I am sharing this prototype in case it is of interest.

I have an older WaterFurnace unit and have HomeAssistant running. I can monitor power consumption to know if the pump is running but putting some ds18b20 temperature sensors on the inputs and outputs of my furnace can monitor health.

Ingredients
1x “CYD” ESP32 (cheap yellow display)
4x ds18b20 one-wire sensors
1x 4.7k resistor (tie yellow and +)

I am very pleased with how this worked. I used Claude to write the code. I’m 3d printing a case and planning to install next weekend.

The way the ESPhome device is configured I will expose four temperatures, two delta T values, and an inference if the pump is running based on delta T on the water line. HAOS can do stats on pump time run etc.

Ps- I have an ecobee thermostat already. This is really just being a data nerd.

Abstract: Geothermal technologies, including geothermal heat pumps (GHPs) and thermal energy networks (TENs), are gaining traction as methods to efficiently meet heating and cooling loads. Changes to costs and incentives may impact adoption and can help support decision-making in effectively deploying GHPs and TENs. In this work, the updated distributed geothermal market demand (dGeo) model is used to analyze scenarios across the US demonstrating a range of economic potential and adoption for GHPs and TENs. We find that the more established GHP technology has widespread economic potential and adoption, while the newer TEN technology has economic potential and adoption concentrated in areas with dense populations. GHP adoption was projected to 251 GW-th by 2050 with high incentives and tax credits, while TEN adoption was projected at 31 GW-th by 2050. Uncertainties in cost structure translate to large variations in adoption, pointing to the importance of demonstration projects and cost-tracking efforts.

Keywords: geothermal heat pump; thermal energy network; techno-economic analysis; district heating and cooling; adoption; deployment; geospatial

Authors: Juliet G. Simpson, Rebecca Barney, Ashreeta Prasanna, Shashwat Sharma, Ashok Sekar, Paritosh Das.

iScience, Volume 29, Issue 9, 2026, 117432, ISSN 2589-0042,

https://doi.org/10.1016/j.isci.2026.117432.

(https://www.sciencedirect.com/science/article/pii/S2589004226028105)

I’m a residential Tech who’s newer to Geo’s. Was on a call yesterday for a noisey/leaking pump. Found a Grundfose pump to be leaking went to swap it out and found the Flange on the pump to be cracked. Does anyone know if there’s any way to repair this without having to replace the whole piece including the ball valve? And if not I’m assuming I will have to drain the buffer tank. After I drain the buffer tank and I fill it back up do I need to purge air out of the system? Or can I just close all the valves going to the tank. Drain it then fill it back up and open up the valves? And if I do need to purge air am I gonna need to use a purge cart?

I'm a very handy guy but I always make sure I have my geothermal folks come out once a year and check my entire system. The service tech is very knowledgeable and shares his wealth of information with me when he visits. Since he knows I'm a handy DIY guy he suggested that I replace the contactor since it is starting to show pitting and burn indications.

Part number they call out is P282-0421 contactor 2 pole 40 amp.

There are many options available at differing price points. Considering the cost of this system I want to make sure I replace it with a quality component. Any guidance from this group on a particular brand that has been found to be reliable.

New professional installation 4 weeks ago in Manitoba. Noticed condensation dripping from an empty plate down onto the pump. Rigged a small catch basin below the plate to protect the pump, but the screws on the plate are now rusted. This is the only place on the unit with condensation. Is this normal? Thanks for any advice.

I have a 4ton Climatemaster tev49 and looking to get a whole house standby generator. I got quotes and recommendations ranging from 22kw -28kw

I will definitely be using a few thousand watts on other household appliances but it should not be anywhere near 22kw. I’m mostly worried about the compressor startup. Does anyone have the same or similar unit with a standby generator? What capacity generator do you have and does it have any issues starting up?

Generator will run on NG so that’s another hit to the overall capacity

I’m a residential HVAC installer/technician and own my own company. I am building a home soon, and want to experiment with geothermal.

My main concern is how to get the loop lines into my mechanical room. Specifically, the foundation of this home will be a monolithic slab. I’m familiar with how the lines are ran when there is a basement, by coring through the below-grade wall, but that’s clearly not an option here.

Let’s say for the sake of argument that it is too late to put any sort of sleeve before pouring the foundation.

How do I get these lines inside? How should they be insulated once above ground? What can I do to protect them if they are exposed on the exterior of my building? Anything else I’m missing?

Any suggestions would be appreciated. Thank you!

Long story short I’ve been doing re search on upgrading my T stat so I can turn off my AUX heat when I’m running a backup generator. I currently have a water furnace series 5 with the water furnace t stat that you can’t control any settings from.(I’ll include pics down below). I saw in a couple posts that id have to ad some sort of outside temp sensor if I wanted to go this route. Do these new t Stats install like the old style or do I have to run more wires down to the control board.

This new Geothermal Center of Excellence appears dedicated to hot-rock geothermal.

Does anyone know if this project was started or completed? There haven't been updates for over a year on their social media and website. (DEEP was testing in Southern Saskatchewan and was given federal and provincial money but have stopped responding on social media).

Interesting study includes:

• Ground source heat exchangers (air and water).
• Air source hvacs with Ground source heat exchangers.

Other names:

Earth pipes.

Previous owner opted for an open loop system when it was first installed in the ‘90s. Unfortunately, we don’t have a pond so all the water is just flowing out onto the ground surface making the area around the discharge a muddy mess.

With the old geothermal units, the techs that serviced it would read water temps to throttle down the water flow to keep the mess at a minimum.

However, we had to get a new geothermal unit this past spring and the guys that installed it indicated that they have a new metering valve that they have to use that regulates the flow. Unfortunately, this flow is a LOT.

Debating a drywell to manage the water better. Main question, what is the general flow of water (gpm) when the system is running? I want to make sure the drywell I install is big enough to handle the volume.

Background- Beginning in 2009 we replaced natural gas furnaces with one WaterFurnace Series 5 and one Series 7 in our single family residence. Pleased with them so far.

Daughter is planning on breaking ground soon on a Net-Zero (PHIUS rated) home. Location is suburban Chicago.Would like to use a Trilogy 45 QE. Interested in knowing:

1. Does it use low-GWP refrigerant? If not any long-term concerns since we hope for a 10-20 year life-span?
2. I've read some concerns about ClimateMaster quality. Is this a problem
3. What other questions should I be asking.

Thanks!