Derry Plumbing, Heating & Air Conditioning

John P.

I used this company in Sept. 2018. My request was to get a hot water heating furnace that hadn't been operated for 5 years checked out and whether it was worthy of firing up. I know it was my mistake of accepting a verbal quote and not requesting anything in writing, but to be fair, he didn't offer a written quote either. All of the pressure relief valves and other coupling on the furnace had burst due to what water had been left in the system when shut off which would have to be replaced before being able to use the furnace again. I told him not to do anything about any leaks in the piping throughout the house, that I would make all those repairs. His verbal quote was $800 and I gave him a key as the house was empty at the time. He said it would likely be an all day affair, a Friday.


Monday, I was there working on other things and his employees showed up. They had replaced all the valves and coupling and told me that they did three repairs on leaks on the first floor baseboard heaters. I told them they weren't suppose to do any of that work. Doing our talk, one employee said they had been there about 4 hours Friday, the other said more like three hours. After about another hour of doing a tune-up, they opened up the viewport and fired it up. They immediately shut it down and after poking around in the furnace with a rod and flashlight, told me that the inside firebox ,wall, whatever had failed and that they would have to disable the furnace before leaving. He called and talked with Dave awhile, then told me it would be around another $800 to replace the firewall. They had never opened the furnace and vacuum or visually inspected the chamber.


The next day, he called my sister, the estate executor, and requested $1500 for the work they had done thus far. When she inquired about the increase, he mentioned the three leaks and that he gets $250 per leak. He quoted a replacement furnace for around $7-8000 with no allowance for work performed so far and that he considered himself to be in the middle as far as his pricing.


We had the furnace replaced by live free for $10,000+. The newer systems don't need all the pressure relief valves and such, so that was all money down the drain. They stayed with us right up to the inspection by the fire department

Telling my story to various fiends and Derry business owners, I kept getting told I should have asked them about him. They would have told me to stay away. I was also told he use to sell used cars, though I can't verify that. If you do deal with this company, make sure you protect yourself with a scope of work contract, and get other quotes.

Lisa W.

I had a frozen pipe that burst and ruined my hot water heater. Dave was very helpful and responsive. 3 days later and I have hot water again. His guys were great! I recommend This company!

Chris B.

Called with what seemed to be a bad zone valve. My thermostat would be off and my condo would still be extremely hot. Called Derry plumbing and heating, as recommended by my property management, asked prices, 800 dollars to pur in a valve with just a knob, i asked price to have valve with use of thermostat the only answer i was given was ""drastically more expensive"". I had them replacr the valve this past weekend with the knob. I have had it turned off and temps are still the same as before, extremely warm. Called to see what could be done as i paid 800 to fix it, and i just got the run around for answer. Seems scam like to me.

Nick Z.

The crew replaced our water heater today, and brought the connections up to code. No surprises, job was done quickly, and the estimate provided prior to the job was exact and fair. David was very responsive to questions and with scheduling prior to the intallation.

Jason S.

If you want poor customer service, and inappropriate foul language from the owner while discussing services rendered then this is your contractor. We recently had our HVAC system replaced. The wiring on the systems was sub par, and interfering with the placement of the hepa filter . I am an electrical engineer and qualified to recognize such issues. When I questioned the work done the owner was extremely foul with language and non responsive to the issues at hand. This company may give you a low bid, but will deliver sub par work and not stand by their work. Buyer Beware!!

Fat J.

We just experienced a frozen baseboard heating pipe. I called several plumbers and was told the wait would be 5-7 days to get someone out. Called Derry Plumbing and Heating. Very nice girl on the phone took my number and would call right back. She did in about 5 minutes. Told me someone could come out the next day. Technician Sean showed up 1 1/2 hours early. Found the split in the pipe, cut it out, replaced the section of copper pipe then filled and purged the heating system. Everything was done great. Cleaned up after himself. Very very satisfied. Reasonable price considering it was an emergency.

Shellee H.

They over charge for basic installation for a toilet.....I just need a toilet remounted after getting the floors replaced... They charged me $429.00...which I found to be very pricey for the work involved....The Plumber they sent out was unalbe to reinstall my pedestal sink because he claim the faucet was wrong, So I had to do it myself which is working just fine....Buyer beware....I will never call these people again or recommend anyone else to call them.....VERY VERY BAD

Natasha R.

Five stars to this company they saved our lives today had to call at 7am this morning with a backed up sink got a return call 15 minutes later with the time they were able to fit us in. When they arrived they diagnosed and fixed the issue quickly and thoroughly! Knock on wood we don't have another issue where we have to use them but if we did they'll be the first plumbing company we use! Thanks Londonderry Plumbing and Heating!

Update 12/28 still would give a five star rating our hot water heater started leaking today gave them a call they were there to fix it right away great reliable company!

Caleb W.

Called them to replace a broken drain in my kitchen, they are prompt, but charged me an outrageous $500 to replace a drain.. took him about an hour. Pvc is not expensive. Then he replaced 2 valves for another $200???? Stay away from these thieves. Unfortunately my plumber was out of town, He called me back and told me he would have been around $300. I wish I could put 0 stars.

Mark L.

I wanted to give you folks a heads up on a plumber I had some problems with recently. His name is Dave Benedict and he uses three different company names. They are Derry Plumbing, Londonderry Plumbing and Salem Plumbing.

I needed a new steam boiler. He matched a price from my lowest bid. I went with him because he spoke about how my furnace needed a sprinkler head above it to meet code regulations. (The other bid did not include this.) I had a conversation with Dave and let him know there was sheet rock above the furnace area. Did I still need the sprinkler valve? He said ""YES"" since the furnace was not walled in, it needed the sprinkler head.

He gave me a verbal description for his quote but not a written one. This was a mistake on my part because he could change it at will (and he did). After the furnace was installed, he told me that it needed a new auto water feed valve that would be another $589. He said that he informed me of this at the very beginning. I do not recall any discussion of it. If I had known the additional cost I would have gone with the competitor. I think I was involved in a Bait and Switch.

The other lowest bid came from Paradigm Plumbing. It included the auto water feed in the written price quote but not the sprinkler head.

After the job was completed, I realized Benedict had not installed the sprinkler head. When I first questioned him on the missing sprinkler head, he told me because I had the sheetrock I didn't need it. This was the exact opposite of our earlier conversation. When I questioned him on charging me for the water feed, he got belligerent with me and would not reduce his price. He did say he would install the sprinkler head but has not done it as of yet.

He also informed that he would take care of all the necessary permits. I called the Town of Derry to see if permits were pulled. The answer was ""NO"". This was another lie on Benedict's part.

I would not recommend Dave Benedict (Derry Plumbing, Londonderry Plumbing and Salem Plumbing.) to anyone. I hope that all of you will remember his name and his companies and tell your friends to stay away from this plumber.