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When a radiant heating circulator died ahead of a weekend of severe cold, a 2026 customer said they called 603 OBS, it arrived within a few hours with a replacement circulator, and heat was flowing within the hour. On its BBB profile, the company describes itself as providing 24-hour in-home service on oil burners and installing new heating and air conditioning systems, including mini splits. Its New Hampshire HVAC license is active on the state registry, with Peter E Belliveau as the holder of record. On Google it holds 4.9 stars from 34 ratings, and the BBB gives it an A+ grade. A 2026 customer said Pete and Kyle replaced their heating system, showed up on time and returned phone calls in a timely manner. That 2026 customer also wrote that they later stopped in to see if the new system was up and running correctly. A 2026 reviewer wrote that Kyle and Pete installed a new boiler for them years ago. A 2026 customer said Peter and Kyle took the time to answer their questions. In a 2024 review, a customer who had been unable to get anyone out to service their furnace said Kyle and Peter fit them into a busy fall schedule, and described them as a father and son team. A 2024 customer wrote, "they squeezed me in even though they were booked solid," and said they were very good at explaining what was going on with the boiler. A 2024 customer said they came out to diagnose a complex radiant heat system and got it back going. A 2024 customer who bought a 120-year-old home with a heating system that was breaking said they worked out a conversion plan with Kyle and Pete to gas with mini splits for each apartment unit, and that everything got installed.
Kyle and Pete are absolutely fantastic! They are family run and operated and are top notch. They installed a new boiler for us years ago and are now our “go to” people. They are fair priced, trustworthy and incredibly professional. If I could give them 100 stars I would!
We are not people who usually write reviews, but the service that Pete and Kyle offered to us was above and beyond what one would expect. Right from the start they showed up on time!! Phone calls were returned in a timely manner! They made the experience of having to replace our heating system as seamlessly as possible and with total pride taken in their work. Absolutely awesome. So happy we had their service. We will have them out for other work we may need here in the future. Thank you so much Pete and Kyle!! Update: February 2026 These guys continue to show care and concern towards their customers! On a personal note, they checked in on us during a recent difficult time after a couple of losses! They stopped in and made some time to check in and see if the new system's up and running correctly. We are working on having them come out for something on more of an important customer education situation with the new system to keep it at its best, and are working to get an app't soon all the while in between this extremely cold Winter! But they have been responsive and really care to keep the customer connection! Something you don't always see these days. Thanks 603.
On what was going to be a weekend of severe cold, our primary radiant heating circulator died. Called 603 OBS and they arrived within a few hours with a replacement circulator. Heat was flowing within the hour. Can't say enough good things about them.
Peter and Kyle provided timely and compassionate service, and were very informative. They took the time to answer my questions and provide additional information I was curious about. They clearly care about and prioritize their customers. Great local business!
Peter and Kyle are amazing! 100% recommended. I can go into detail, but they are amazing. Cannot recommend enough.
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1 change recorded — last scanned Oct 7, 2026.
Typical New Hampshire range for this kind of work, from regional averages — not a quote from 603 Oil Burner Service Heating & Cooling. 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
Careful system sizing spec'd thoroughly before install3.3
Next-day work3.2
State-verified HVAC license since 2010Not yet rated
Old boilers kept running3.7
Ten-fixture installation praised by a 2019 customer3.0
One week from quote to mini-split install4.6
