Air building up in radiators
Air sitting in radiators blocks the water and leaves rooms cold. Bleeding them in the autumn keeps the whole system heating evenly.
A seasonal boiler check, done before the cold arrives
Boiler maintenance Denver, ahead of heating season
Denver boilers carry a long season — the city heats for most of the year — and the ones that break in January are usually the ones nobody opened the previous autumn. This page covers what a seasonal boiler check looks at: burner, water side, radiators, controls.
Call any time
Call (720) 806-7634
Lines stay open all night and all weekend. Ring (720) 806-7634, name the boiler and the year it was last serviced, and a date gets set.
Call Now (720) 806-7634 →Phone-only booking — ring and a date is set.
Checked before the season, not during a breakdown.
About this service
Boiler maintenance in Denver: what the check covers
A boiler check is planned work, not a breakdown call. Burner and heat exchanger, pressure and expansion tank, circulator and controls, radiators room by room — each gets looked at before the heating season asks the most of the system.
A Denver boiler works a harder season than one in a mild climate. Close to 6,000 heating degree days each year, and the water side wears without announcing itself: air collects in radiators, pressure drifts, a pump starting to seize gives little warning. Radiator homes across Capitol Hill, Washington Park and Highland gain the most from a fall check.
- ✓Burner and heat exchanger inspected
- ✓Pressure, tank and pump checked
- ✓Radiators bled and balanced
- ✓Controls and safety devices tested
What's included
What a boiler maintenance visit includes
Every item below gets a reading or a hands-on test, in the same order each time, so nothing is skipped and the results can be compared year to year.
✓
Burner and heat exchanger inspection
Flame pattern, sooting and scale on the burner and heat exchanger. A burner lighting unevenly is the first sign of a January breakdown.
✓
Pressure and expansion tank check
Pressure read hot and again cold, and the expansion tank checked for a bladder that has gone flat. Pressure climbing each time the boiler fires points at the tank.
✓
Circulator pump tested
Flow and noise from the circulator, read on a meter. Far radiators going cold first is how a seizing pump shows itself, and the meter catches it before it stops.
✓
Radiators bled
Air bled from every radiator and the high points, then each radiator checked room by room, so far rooms heat the same as near ones.
✓
Controls and safety devices tested
Thermostat, zone valves, relief valve and low-water cut-off, each tripped or tested to prove it works when it should. A safety device that never trips is worse than none.
✓
Full heat cycle run
One complete firing run, with supply and return temperatures taken, so the cycle holds steady through winter.
How it works
How a boiler maintenance visit works
01
Call and book the visit
Ring (720) 806-7634 and say what boiler heats the house, how old it is, and what you have noticed. A date is set and the check talked over.
02
Inspection at the boiler
The boiler is opened and the burner and heat exchanger looked over, with pressure and temperature gauges read.
03
Water side checked
Tank and circulator are tested, pressure read hot and then cold, and air bled from the radiators.
04
Testing through a heat cycle
A full heat cycle runs, supply and return temperatures are taken, and radiators are felt room by room.
05
Findings explained
What was found is talked through in ordinary words, and a worn component is pointed out to you on the boiler itself.
Tools & methods
Tools and methods we bring to a maintenance visit
The instruments below are what separate a guess from a reading on a boiler.
Combustion analyzer
Carbon monoxide and flue temperature, taken once the burner has been looked over, to show the boiler burns cleanly and vents as it should.
Pressure and temperature gauges
System pressure hot and cold, supply and return temperatures — the numbers that say whether the water side is healthy.
Multimeter
Ignition, controls, circulator and zone valves, tested for wear. A meter reading that keeps climbing points at a pump on its way out.
Radiator key and bleed kit
Air out of radiators and high points, so water reaches every radiator again.
Infrared thermometer
Each radiator's temperature, taken room by room, so a cold one is traced to its cause instead of guessed at.
Borescope
Inside the heat exchanger, past what the access panel shows, looking for scale and corrosion.
Common situations
Boiler checks we do across Denver
A boiler that has not been serviced in years
Situation
A boiler in Denver that has never been opened since it was fitted. It still heats, but rooms far from the boiler are slow to warm.
What we check
Burner looked over, pump and tank tested, radiators bled, heat cycle run with temperatures taken.
Pressure that keeps dropping
Situation
A boiler in Washington Park keeps losing pressure over a few weeks and needs topping up again and again.
What we check
The expansion tank is looked at, and valves and joints hunted for a slow leak. Falling pressure always has a cause behind it.
A new home, first winter in Denver
Situation
New to Denver, a family finds a boiler with no service history and no record of its age. Its condition before winter is what they want to know.
What we check
Burner, water side, radiators and controls are all worked through, and what was found is talked over in ordinary words.
Problems we solve
What boiler maintenance catches early
Most boiler breakdowns give warning in the autumn. This is what a seasonal check is built to catch.
Ask a pro →↗
An expansion tank going flat
When a tank bladder goes flat, pressure rises with every firing until the relief valve lets go. A fall check takes the most common pressure complaint Lion Tech Home Services sees off the table.
A pump starting to seize
A circulator starting to seize turns noisy and shifts less water. Testing it in the autumn finds it before far radiators go cold in January.
A burner lighting unevenly
Soot and scale build on the burner and bring delayed ignition and rumbling. Cleaning the burner in the autumn keeps lighting even through the season.
Proof you can check
Boiler maintenance proof you can check
With a median build year of 1975 and about a third of Denver homes built before 1960, many boilers in the city are serving radiators far older than the boiler itself — the water side is where the wear hides.
Customer reviews
What Denver customers say
Lion Tech Home Services is rated 5.0 stars on Google, from 11 reviews that are all five stars.
“Martin was great! Timely, knowledgeable, and his experience showed. He was able to fix our HVAC that had been having trouble on and off for awhile. Pricing was good and reasonable! Would certainly recommend!”
Julie — Google review
Before the heating season starts — the usual window is September to November. Denver heats for a long season, and the check belongs before the boiler carries its heaviest load.
Burner and heat exchanger, pressure and expansion tank, pump and controls, radiators bled, full heat cycle run.
Yes — heating can look fine while a part wears out. A seizing pump or a flat tank fails without warning, and the check spots those parts before a no-heat call.
A radiator hot below and cold above has air trapped inside. Bleeding belongs to the check, and the way to do it is shown to you, so the sign is easy to spot next time.
Ready when you are
Get the boiler checked before winter
Ring (720) 806-7634 to set a boiler maintenance date. Each item is read or tested in turn, and what was found is talked through with you.
Call (720) 806-7634 →
Request an appointment
Contact Lion Tech Home Services
Lion Tech Home Services, Denver — call (720) 806-7634, open 24 hours.