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Jack Downing

Jack Downing

Service Specialist

Rating

Reviews

LICENSES: GAS SERVICE

Continuing the family tradition, Jack brings a high level of technical precision to every home he visits. As a Service Specialist, Jack is a key part of the second-generation era of GSMS, dedicated to technical excellence and the ‘Service with a Heart’ philosophy.

Name: Jack Downing

Recent Jobs and Reviews

Rated 5.0 out of 5 stars based on 149 customer reviews

Customers say: The recent reviews exhibit a predominantly positive sentiment, with recurring themes of satisfaction, professionalism, and expertise. Customers express gratitude, recommend the company, and acknowledge the quality of the work performed. Positive reviews frequently mention friendly and knowledgeable technicians, timely responses, and efficient service. Negative reviews are minimal and do not represent a clear, recurring trend. Overall, the reviews suggest a positive experience with the company, with many customers expressing satisfaction with their HVAC and plumbing needs.

Job Locations and Reviews

Nashua, NH - I found the old valve that serves the out door faucet to ve the cause of the leak. I quoted a replacement. Thank you!
Jack D.
Jack D. Checked in
I found the old valve that serves the out door faucet to ve the cause of the leak. I quoted a replacement. Thank you!
Nashua, NH 03062
Jack D.
Jack D. Checked in
We will safely replace your existing 40-gallon electric water heater with a brand-new, direct replacement unit in the same location. This installation includes complete code compliance for the city of Manchester, as well as a leak detection and shut-off system to protect your home. Scope of Work: Removal & Disposal: Safely drain, disconnect, and remove the existing 40-gallon electric water heater. Plumbing Modification: Cut out and remove the existing sediment filter on the water line. Because your home is on municipal city water, this filter is unnecessary; removing it will streamline your plumbing and eliminate a potential maintenance headache. New Tank Installation: Provide and install a new 40-gallon electric water heater in the existing location. Code & Performance Upgrades: Provide and install all new essential components to meet current Manchester plumbing codes and extend the life of the tank. This includes a new thermal expansion tank, a thermostatic mixing valve, and a v
Manchester, NH 03101
Repair piping in closet that rodents chewed. Replace 2 valves under sink. We will quote to repair main shutoff valve and replace the hot and cold manifolds.
Repair piping in closet that rodents chewed. Replace 2 valves under sink. We will quote to repair main shutoff valve and replace the hot and cold manifolds.
Jack D.
Jack D. Checked in
Repair piping in closet that rodents chewed. Replace 2 valves under sink. We will quote to repair main shutoff valve and replace the hot and cold manifolds.
Derry, NH 03038
Jack D.
Jack D. Checked in
I believe the burning smell was caused by loose insulation threads making contact with the hest exchanger. I removed the threads and the smell went away.
Nashua, NH 03062
Replaced the failed indirect water tank. Checked for leaks and there was none. Replaced the domestic water expansion tank. Completed the maintenance on the boiler. I started off with checking all the wiring connections and everything looked good. Next I pulled the flame sensor and cleaned it. I vacuumed out the burners and the burner box. I checked incoming and outgoing gas pressure and those were accordance to manufacturer specifications. I inspected all the boiler accessories and the only thing that I found was that the high vent was leaking water. Lastly I ran the unit and performed a combustion analyzer test. This checks the unit CO, CO2 and oxygen levels. The boiler was running good. I bled the air from the hot and cold water lines before I left.
Replaced the failed indirect water tank. Checked for leaks and there was none. Replaced the domestic water expansion tank. Completed the maintenance on the boiler. I started off with checking all the wiring connections and everything looked good. Next I pulled the flame sensor and cleaned it. I vacuumed out the burners and the burner box. I checked incoming and outgoing gas pressure and those were accordance to manufacturer specifications. I inspected all the boiler accessories and the only thing that I found was that the high vent was leaking water. Lastly I ran the unit and performed a combustion analyzer test. This checks the unit CO, CO2 and oxygen levels. The boiler was running good. I bled the air from the hot and cold water lines before I left.
Jack D.
Jack D. Checked in
Replaced the failed indirect water tank. Checked for leaks and there was none. Replaced the domestic water expansion tank. Completed the maintenance on the boiler. I started off with checking all the wiring connections and everything looked good. Next I pulled the flame sensor and cleaned it. I vacuumed out the burners and the burner box. I checked incoming and outgoing gas pressure and those were accordance to manufacturer specifications. I inspected all the boiler accessories and the only thing that I found was that the high vent was leaking water. Lastly I ran the unit and performed a combustion analyzer test. This checks the unit CO, CO2 and oxygen levels. The boiler was running good. I bled the air from the hot and cold water lines before I left.
Hooksett, NH 03106
Jack D.
Jack D. Checked in
Boiler flow switch is bad. I installed temporary low water cut off in order to keep the boiler on line for the residents. We will order the switch and return this week to replace it.
Concord, NH 03301
Jack D.
Jack D. Checked in
Add in a pressure reducing valve.
Manchester, NH 03102
Manchester, NH - Replaced water heater.
Jack D.
Jack D. Checked in
Replaced water heater.
Manchester, NH 03102
Jack D.
Jack D. Checked in
Water heater estimate.
Merrimack, NH 03054
Jack D.
Jack D. Checked in
Add waste water check valve in basement trap. Add water hammer arrestors to washing machine valve. Perform comprehensive water test to drop off at NH State certified water testing facility.
Amherst, NH 03031
Replace toilet. Cutout old iron flange and add stainless steel flange. Replace Kohler canister gasket. Measure shower for replacement.
Replace toilet. Cutout old iron flange and add stainless steel flange. Replace Kohler canister gasket. Measure shower for replacement.
Jack D.
Jack D. Checked in
Replace toilet. Cutout old iron flange and add stainless steel flange. Replace Kohler canister gasket. Measure shower for replacement.
Hollis, NH 03049
Jack D.
Jack D. Checked in
To permanently resolve the leak and ensure safe, consistent water temperatures, we recommend a complete internal rebuild of the shower valve using genuine OEM Kohler replacement parts. We do not recommend a "partial" repair, as disturbing the old, hardened O-rings on the secondary components will likely cause new leaks behind the finished wall.
Manchester, NH 03102
Jack D.
Jack D. Checked in
I reccomend replacing water tank due to high TDS on hit water, yellow color, and anode rod being completely gone.
Manchester, NH 03102
Jack D.
Jack D. Checked in
Replace anode rod. Cut out corroded fitting and replace. Check for leaks and purge air from hot water lines. Thank you!
Amherst, NH 03031
Estimate for steam shower generator replacement.
Estimate for steam shower generator replacement.
Jack D.
Jack D. Checked in
Estimate for steam shower generator replacement.
Nashua, NH 03064
Jack D.
Jack D. Checked in
Replace old moen single handle shower cartridge.
Manchester, NH 03102
Jack D.
Jack D. Checked in
Replace moen kitchen faucet cartridge.
Nashua, NH 03062
Tankless Water heater planned service. Everything went great on todays visit.
Tankless Water heater planned service. Everything went great on todays visit.
Jack D.
Jack D. Checked in
Tankless Water heater planned service. Everything went great on todays visit.
Merrimack, NH 03054
Jack D.
Jack D. Checked in
Primary side of transformer shorted out. Caused by power issue on 3/17. I replaced and tested operation. We will order limit switches to replace to help prevent intermittent low voltage short issue.
Londonderry, NH 03053
Jack D.
Jack D. Checked in
Shower valve, 2 new space kick heaters, bleed lines.
Manchester, NH 03104
Jack D.
Jack D. Checked in
Both boilers faulted out. See invoice line item for details. Thank you!
Londonderry, NH 03053
Jack D.
Jack D. Checked in
Replace filter housing.
Henniker, NH 03242
Londonderry, NH - See invoice line item descriptions* Connected the temperature and pressure relief valve overflow pipe correctly.
Jack D.
Jack D. Checked in
See invoice line item descriptions* Connected the temperature and pressure relief valve overflow pipe correctly.
Londonderry, NH 03053
Jack D.
Jack D. Checked in
Replace batteries in downstairs thermostat.
Milford, NH 03055
Jack D.
Jack D. Checked in
Install pressure reducing valve and check valve.
Merrimack, NH 03054
Review
Excellent service.
Kathleen - Merrimack, NH 03054
Review
Professional service
Paul - Nashua, NH 03062
Review
When a GSMS contractor comes to your home, it’s not just another contractor doing a job, it’s a personable experience from someone who truly cares about the neatness and quality of their work to the quality of their relationship with you, the customer… they quickly feel like an extension of your family making you look forward to their visits and not feeling concerned in any way how it’s going to go. Always 5 stars from me and two thumbs up, if I can count my big toes, it’s 4 digits up from me!! 👍👍👍👍🙂🙂
Martin - Stratham, NH 03885
Review
Great work as always
Mark - Hollis, NH 03049
Review
Jack did a super job! Very thorough and competent. I feel like I’m in good hands with GSMS.
BJ - Merrimack, NH 03054
Review
Jack from GSMS came today and serviced our tankless hot water heater. Excellent job as always
Tom F - Merrimack, NH 03054
Review
Excellent Service
Guimont - Londonderry, NH 03053
Review
I never thought I’d meet anyone as cool nice and kind as Mark but Jack was amazing. He took on the dirty job.. No problem He was super communicative and explained everything. I’m really grateful to have Granite State Mechanical on speed dial.
Kathleen - Nashua, NH 03064
Review
Jack was once again on time, diagnosed the problem quickly and fixed it. All GSMS staff are courteous and extremely professional. I wouldn’t go with anyone else.
Ronald - Merrimack, NH 03054
Review
Excellent work
Turning - Manchester, NH 03103
Review
No heat emergency situation handled immediately on a Sunday evening. Great service!
Paul - Amherst, NH 03031
Review
Jack was prompt and did a great job tuning our furnace.
Vincent - Nashua, NH 03064
Review
Did annual maintenance on the furnaces so we are all set for winter!
Lori B - Nashua, NH 03060
Review
Excellent service!
Darlene - Manchester, NH 03109
Review
Jack was awesome! Showed up for an emergency on a Sunday and was able to remedy the situation in no time! He took the time to explain everything throughout the process and was very thorough and efficient!
Chris - Barrington, NH 03825
Trusted Quality & Service