Boiler Repair & Installation in Santa Fe, NM
A lot of Santa Fe houses heat with water, not air — boilers feeding radiant slabs or fin-tube. At 7,200 feet the burner needs the same altitude honesty as a furnace, and a stuck zone valve is why one wing of an adobe is 58°F while the sala is 76. We repair circulators, expansion tanks, and controls, and we install boilers sized for elevation, not a sea-level sticker. 505-316-4231.
A lot of Santa Fe houses heat with water, not air — boilers feeding radiant slabs or fin-tube. At 7,200 feet the burner needs the same altitude honesty as a furnace, and a stuck zone valve is why one wing of an adobe is 58°F while the sala is 76. We repair circulators, expansion tanks, and controls, and we install boilers sized for elevation, not a sea-level sticker. 505-316-4231.
Content reviewed 2026-10-01.
Radiant is not a mystery if you live here
Air in a loop, a dead pump, a failed zone valve, or a boiler that short-cycles on a dirty heat exchanger covers most January calls. We bleed, test, and replace the part that failed — we do not rip out a working radiant slab because a pump seized.
Altitude and combustion
Rich combustion soots exchangers and makes CO. We set orifices and verify combustion numbers. A “it lit, so it’s fine” install is how people get headaches.
A boiler is not a furnace with water in it
Hydronic heat in Santa Fe shows up in older homes, radiant slabs, and a lot of baseboard that was tied to a cast-iron boiler decades ago. The failures are pressure, air, a circulator, a cracked section, or a burner that was never set for 7,200 feet. They are not “the filter.” If someone sold you a furnace tune-up on a boiler, they did not look at the machine. We look at the sight glass or the pressure gauge first. A boiler that is at zero when it should hold 12 to 15 psi is not a thermostat problem.
Low pressure, the relief valve, and the fill
A relief valve that drips has a reason. High pressure from a failed expansion tank, a waterlogged tank, or a fill valve that does not stop. We do not keep replacing relief valves. We find why the pressure climbs when the boiler fires. Bleeding air at a baseboard is sometimes the whole repair, and sometimes it is a sign the automatic air vent has failed and the loop is gulping every cycle. We fix the vent. We do not sell a new boiler because one zone gurgles.
Combustion at this elevation
Gas boilers soot their chambers when the orifice and the air shutter are still at a sea-level setting. Soot is an insulator and a carbon monoxide risk. We clean, we set the flame, and we test. A cracked section weeps water into the chamber and rusts from the inside. That boiler is finished. A section repair on some cast-iron models is real; on others the cost of the section and the labor meets the cost of a new boiler, and we will put both numbers on the same page. You pick. We do not hide the replacement price until the old one is in pieces on the floor.
Zones, pumps, and the house that heats one room
One cold room on a zoned system is often a zone valve or a pump, not “the boiler is small.” We check that the boiler is making hot water, then we check that the hot water is leaving the manifold. A seized circulator, a zone valve that never opens, or a thermostat that is lying will all look like a dead boiler from the hallway. Parts cannons are expensive. We swap the failed part. If the heat exchanger is the failure, we stop pretending a pump will save it.
What maintenance actually is
A boiler visit that matters includes pressure, the expansion tank, the relief, combustion, and a look at the near-boiler piping for leaks at the air separator and the circulator flanges. It does not include a speech about a maintenance plan you did not ask to hear. If the system has no low-water cutoff and the code or the manufacturer wants one, we say so once. Historic houses with the boiler in a pit need combustion air. We will not close that pit in with storage boxes and call the boiler serviced.
Arrival on a no-heat boiler call
Gauge first. A boiler sitting at zero is not going to heat the floor no matter what the thermostat says. We look for the leak that dumped the pressure before we fill it, because filling a leaking boiler just runs fresh water through a heat exchanger and speeds the rust. If the pressure is normal and the burner is not firing, we follow the safety chain: switch, rollout, low water, vent, ignition. Air in the radiation is checked after the boiler is actually making hot water. Bleeding a cold, dead boiler does not tell you anything.
Parts we carry and parts we do not
Circulators, zone valves, and common aquastats for the boilers we see in Santa Fe are the parts worth stocking. A cast-iron section is not on the truck, and a control from a discontinued boiler may be a day away. We will not leave the system filled and firing if a control that limits temperature is the failed part. Heat without a limit is how a relief valve becomes a steam whistle. If the part is overnight, you get a space-heat plan that is honest: space heaters are a bridge, not a repair, and we do not pretend the pipes are safe if the house is going to freeze.
The note we leave on the boiler
Pressure when we arrived, pressure when we left, what we replaced, and whether the expansion tank held air. A future tech — us or someone else — can read that. Flame set for elevation gets a line if we touched the burner. If we did not touch combustion because the call was a circulator, we do not claim we tuned it. Call 505-316-4231 and say boiler, the brand if you can see it, and whether any zone still heats.
Repair, section, or a new boiler
A circulator, a valve, an expansion tank, or a control is a repair. We stock or we get those without turning the visit into a sales meeting. A cracked section on a cast-iron boiler is the middle case: sometimes the section is available and worth it, sometimes the labor meets a new boiler. You see both numbers while the old boiler is still in one piece. A new boiler is a different day. It includes near-boiler piping, the relief, the expansion tank, combustion air, and a permit. It does not include new baseboard through the whole house unless the old radiation cannot work with the new water temperature. Condensing boilers and old cast-iron radiation do not always like each other. We will not force that match to chase a efficiency percentage. Venting a new boiler in an old Santa Fe chimney gets the same honesty as a furnace: liner or do not use that chimney. Glycol, if the system has it, has to be compatible with the new components. We test or we ask. Filling a glycol loop with tap water because it was faster is how the next winter splits an element in a vacation house. If this is a vacation house, say so. The maintenance plan changes.
Brand, pressure, and which rooms still heat
A photo of the front of the boiler showing the gauge is the best thing you can send. Zero pressure with a wet floor is a leak. Normal pressure and one cold zone is a valve or a pump. Normal pressure and no flame is the safety chain. Those three photos are three trucks worth of parts. If you have baseboard and a boiler, say both. If the system was converted from steam and still has old radiators, say that too. We have opened the wrong parts bin for that sentence more than once, and the phone call is cheaper than the second trip.
What we actually get called for
Not a generic list — these are the failures this climate and housing stock produce.
Cold zones
Valve or air. We find which.
Kettling or lockout
Scale or a failing sensor. Hard water belongs in this story.
Pressure that will not hold
Expansion tank or a leak in a loop.
No heat, boiler silent
Ignition, gas, or a locked control. We test, not guess.
How a job runs
Read the system
Zones, fuel, age, last service.
Combustion and hydro
We test both. A clean flame on a dead pump still leaves you cold.
Repair or replace
Quoted with venting and permit if the boiler is coming out.
Questions people ask before they call
Can you work on radiant floor heat?
Yes. Manifolds, pumps, mixing valves, and the boiler that feeds them. We do not demo a slab to chase a pinhole until the evidence says we must.
Is a boiler more efficient than a furnace here?
In a tight adobe with a slab, hydronic is often the better comfort story. Efficiency depends on the boiler age and outdoor reset, not the word “boiler.”
Do you install new boilers?
Yes, high-altitude setups with proper venting and condensate handling on condensing units. Permits included.
City pages that stay
Boiler Repair and Install stays on this URL. Santa Fe, Los Alamos, and Española each have one plumber page. Other towns 308 here or to those three. Call 505-316-4231.
Need boiler repair and install?
Lobo Tech · NM license 384927 · 1259 Coriander Rd, Santa Fe · 505-316-4231