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Grantham Plumbing & Heating has a 1.7-star Google average from 12 ratings. A 2023 customer said Tom had come to the house over the years for several repairs to their old heating system and praised the quality of the work. A 2025 customer said dielectric unions were not used on their water heater, and it needed to be replaced in 6 months. A 2025 reviewer wrote that they "cannot under any circumstances recommend this man for anything related to plumbing or heating." A 2024 customer said the owner resorted to name calling when he disagreed with what they said. A 2023 customer said the owner went on about how they must be on welfare, and that the plumbing issue was not fixed.
Owner seems to be in support of unlawful exclusion of some from public accomodations. Decide for your self if you want someone like that in your home.
Hands down the worst plumber I have even had the displeasure of dealing with. I cannot under any circumstances recommend this man for anything related to plumbing or heating, he should really find another profession
Didn't use dielectric unions for my water heater, needed it replaced in 6 months.
Poor attitude, good luck.
Incredibly unprofessional. Worst service, take your business elsewhere.
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2 changes recorded — last scanned Nov 1, 2026.
Typical New Hampshire range for this kind of work, from regional averages — not a quote from Grantham Plumbing & Heating. Use it to sanity-check bids, then get the real number in writing.
Estimated range
$4,700 – $10,700
Typical HVAC project around $7,700
