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Hydronic boiler

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Home / Outdoor Heating / Hydronic boiler refurbished & used for sale | For Sale USA
Expansion tank for - expansion,

Expansion tank for - expansion,

$55.99
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Zvc404 zone valve control - zone,

Zvc404 zone valve control - zone,

$179.99
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Outdoor boiler unit heater - boiler,

Outdoor boiler unit heater - boiler,

$398.00
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Zvc404 zone valve - valve, control

Zvc404 zone valve - valve, control

$145.00
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Diy outdoor wood boiler - outdoor,

Diy outdoor wood boiler - outdoor,

$150.00
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New durable hydronic boiler - new,

New durable hydronic boiler - new,

$72.97
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Amtrol extrol 15 - extrol, ex-15

Amtrol extrol 15 - extrol, ex-15

$61.70
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Expansion tank for - expansion,

Expansion tank for - expansion,

$55.99
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Cast iron circulator - cast,

Cast iron circulator - cast,

$233.88
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Century boiler hydronic system - century,

Century boiler hydronic system - century,

$29.99
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Expansion tank for - no.,

Expansion tank for - no.,

$64.76
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50k btu outdoor wood boiler - btu,

50k btu outdoor wood boiler - btu,

$269.00
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Zvc404 zone valve control - zvc404-4,

Zvc404 zone valve control - zvc404-4,

$85.00
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R7910a1027 sola hydronic - r7910a1027,

R7910a1027 sola hydronic - r7910a1027,

$399.99
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Ollin hydronic heating boiler - ollin,

Ollin hydronic heating boiler - ollin,

$235.98
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115v 60hz 3 - 15-55, 115v/60hz

115v 60hz 3 - 15-55, 115v/60hz

$69.99
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Taco zone zvc404 valve - zone,

Taco zone zvc404 valve - zone,

$149.00
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Expansion tank for - tank,

Expansion tank for - tank,

$69.13
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Expansion tank for - no.,

Expansion tank for - no.,

$77.48
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Unit heater hydronic 200 000 - heater,,

Unit heater hydronic 200 000 - heater,,

$1270.99
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Watts 374a 030 - 374a-030, boiler

Watts 374a 030 - 374a-030, boiler

$49.00
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400 float air - 400-4, hy-vent,

400 float air - 400-4, hy-vent,

$21.80
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100k new style hydronic - style,

100k new style hydronic - style,

$372.00
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5 or 6 zone boiler - 5,

5 or 6 zone boiler - 5,

$34.19
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New taco 2400 - new!, 2400-20-3p

New taco 2400 - new!, 2400-20-3p

$499.99
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Flex2 htx hydronic boiler - flex2,

Flex2 htx hydronic boiler - flex2,

$45.00
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150k side port hydronic - port,

150k side port hydronic - port,

$582.00
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Outdoor wood boiler plan diy - boiler,

Outdoor wood boiler plan diy - boiler,

$42.64
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Honeywell r8182d1079 aquastat - honeywell,

Honeywell r8182d1079 aquastat - honeywell,

$400.00
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Argo ar861 2ii - argo, zone

Argo ar861 2ii - argo, zone

$239.95
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Cast iron circulator pump - cast,

Cast iron circulator pump - cast,

$277.38
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Honeywell r8182d1079 aquastat - honeywell,

Honeywell r8182d1079 aquastat - honeywell,

$450.00
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Expansion tank for - tank,

Expansion tank for - tank,

$73.07
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Used honeywell - used,

Used honeywell - used,

$48.59
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Speed 150k btu outdoor - 2,

Speed 150k btu outdoor - 2,

$499.00
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Stiebel eltron hydro - stiebel, shark

Stiebel eltron hydro - stiebel, shark

$499.00
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Grundfos upms f wood - 20-58,

Grundfos upms f wood - 20-58,

$249.00
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Expansion tank for - tank,

Expansion tank for - tank,

$77.48
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Safgard low water cut - safgard,

Safgard low water cut - safgard,

$90.00
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Honeywell mcba54201dv10 boiler - mcba54201dv10,

Honeywell mcba54201dv10 boiler - mcba54201dv10,

$259.99
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Two burnham sage sg2 - two, 2.1

Two burnham sage sg2 - two, 2.1

$75.00
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Honeywell aq12c10 outdoor - aq12c10,

Honeywell aq12c10 outdoor - aq12c10,

$29.95
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100k btu outdoor - btu,

100k btu outdoor - btu,

$429.00
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100k side port hydronic - 100k,

100k side port hydronic - 100k,

$372.00
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Expansion tank for - expansion,

Expansion tank for - expansion,

$56.34
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Taco sr501 zone switching - taco, 1

Taco sr501 zone switching - taco, 1

$79.99
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Amtrol extrol in - amtrol, in-line

Amtrol extrol in - amtrol, in-line

$94.49
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Unit heater hydronic 000 - heater,, 70,000

Unit heater hydronic 000 - heater,, 70,000

$685.99
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Grundfos upms f - upms, high

Grundfos upms f - upms, high

$205.25
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Armstrong bf hydronic - h-32,

Armstrong bf hydronic - h-32,

$899.99
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Ups26 99fc 52722512 hot water - 52722512,

Ups26 99fc 52722512 hot water - 52722512,

$96.89
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Central boiler 2900544 50k btu - boiler,

Central boiler 2900544 50k btu - boiler,

$521.34
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Brass float air vent 8in - vent, npt

Brass float air vent 8in - vent, npt

$24.42
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Taco 007 7ifc cast - cast, iron

Taco 007 7ifc cast - cast, iron

$153.00
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R8182d1079 honeywell - r8182d1079,

R8182d1079 honeywell - r8182d1079,

$199.95
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Oem watts bronze check - bronze,

Oem watts bronze check - bronze,

$60.00
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R8182d1079 honeywell - r8182d1079,

R8182d1079 honeywell - r8182d1079,

$79.99
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Honeywell aq2504b2 aquatrol - aq2504b2,

Honeywell aq2504b2 aquatrol - aq2504b2,

$249.95
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Unit heater hydronic 100 000 - hydronic, 100,000

Unit heater hydronic 100 000 - hydronic, 100,000

$849.99
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Hydronic circulator pump - hydronic,

Hydronic circulator pump - hydronic,

$164.49
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Honeywell pv125s supervent air - honeywell,

Honeywell pv125s supervent air - honeywell,

$109.00
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Amtrol extrol boiler - extrol, ex-30

Amtrol extrol boiler - extrol, ex-30

$65.00
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Expansion tank for - 30,

Expansion tank for - 30,

$77.48
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Rinnai heating kit - rinnai,

Rinnai heating kit - rinnai,

$476.53
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Circulator pump 115v hp - pump, 1/6

Circulator pump 115v hp - pump, 1/6

$265.00
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115v circulator pump hp - 115v,

115v circulator pump hp - 115v,

$188.88
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Comstar hydro seal oz - hydro,

Comstar hydro seal oz - hydro,

$18.30
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Vintage 150 purge - vintage,

Vintage 150 purge - vintage,

$75.00
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Honeywell aq2511b0 hydronic - honeywell,

Honeywell aq2511b0 hydronic - honeywell,

$150.00
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R7910a1027 sola hydronic - r7910a1027/u,

R7910a1027 sola hydronic - r7910a1027/u,

$894.00
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Central boiler 5600003 - central,

Central boiler 5600003 - central,

$174.63
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Zilmet gal capacity - zilmet,

Zilmet gal capacity - zilmet,

$39.00
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For 400 npt auto - 400-4,

For 400 npt auto - 400-4,

$21.80
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Ups26 99fc 52722512 hot - ups26-99fc, water

Ups26 99fc 52722512 hot - ups26-99fc, water

$95.69
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Rusco oem 2900578 - rusco, hot

Rusco oem 2900578 - rusco, hot

$181.50
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Zilmet zft8r gal - zilmet, flat

Zilmet zft8r gal - zilmet, flat

$79.26
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Penn gas fired - gas-fired, boilers

Penn gas fired - gas-fired, boilers

$9.99
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Peerless boilers color - peerless,

Peerless boilers color - peerless,

$29.95
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Hydrolevel safgard low water - low,

Hydrolevel safgard low water - low,

$90.00
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Ups26 99fc 52722512 - hot, water

Ups26 99fc 52722512 - hot, water

$100.49
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Corro protec powered - powered, anode

Corro protec powered - powered, anode

$169.95
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Century boiler hydronic system - century,

Century boiler hydronic system - century,

$32.99
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White rodgers 11b18 101 - rodgers, 11b18-101

White rodgers 11b18 101 - rodgers, 11b18-101

$214.49
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Raypak 624a lp raytherm - h3-624a-br-lp,

Raypak 624a lp raytherm - h3-624a-br-lp,

$5500.00
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Unit heater hydronic 150 000 - unit,

Unit heater hydronic 150 000 - unit,

$975.99
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Alorair 100 000 btu hydronic - alorair, 100,000

Alorair 100 000 btu hydronic - alorair, 100,000

$499.99
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Side arm heat - side,

Side arm heat - side,

$142.00
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Finned coil water air - finned, heat

Finned coil water air - finned, heat

$112.99
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Central boiler part 329 - central,

Central boiler part 329 - central,

$244.00
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Automated npt air bleed - 1/8",

Automated npt air bleed - 1/8",

$32.99
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Modine hc18sb01sa hc18 - modine,

Modine hc18sb01sa hc18 - modine,

$629.99
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Outdoor wood boiler five wrap - outdoor,

Outdoor wood boiler five wrap - outdoor,

$3750.00
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Cash acme hydronic - acme, t-60

Cash acme hydronic - acme, t-60

$75.00
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Hydronic heat boiler - hydronic, heat,

Hydronic heat boiler - hydronic, heat,

$70.00
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Honeywell mcba54201dv10 boiler - mcba54201dv10,

Honeywell mcba54201dv10 boiler - mcba54201dv10,

$199.99
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Mixing valve powers - valve, 1/2”

Mixing valve powers - valve, 1/2”

$179.97
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📊96 listings · from $9.99 · avg $314.42
⚠️ These listings were last updated more than 12 days ago. Search for fresh listings

Browse 96 hydronic boiler listings currently in our index. Prices range from $9.99 to $5500, with an average of $314.42. Whether you are hunting for a bargain or looking for a top-spec model, the selection below covers all price points — new, used and refurbished. More about hydronic boiler →

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Everything you need to know about hydronic boiler

Whether you are looking for a brand-new or second-hand hydronic boiler, eBay offers one of the largest selections available online. With 96 active listings at the time of this page's last update, you have plenty of choice across different conditions, sellers and price points. The cheapest option currently starts at $9.99, while premium listings can reach $5500 — giving you a wide budget spread to work with. The average price of $314.42 can serve as a useful benchmark: listings below this tend to be used or auction-style, while those above often include extra accessories, warranties, or are sold by professional sellers with high feedback scores. Always check the seller's feedback rating and return policy before committing to a purchase. If you need the item quickly, filter by "Buy It Now" to avoid the uncertainty of auctions. For used items, look closely at the condition description and photos — terms like "good", "very good" and "like new" can mean very different things depending on the seller.

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