Skip to Content
  • 25+ Years Experience
  • American-Made Quality
  • Expert Technical Support
  • Fast Shipping
  1. Products
  2. Heating System Controls

Heating System Controls

Sort By Sort By: Price - High to Low
518 Video 7hT5NUSZz-M

518

Tekmar PID Non-Programable Thermostat
$ 105.11
355-403

355-403

Legend 3 Branch Boiler Header, 1-1/4 in. X 3/4 in., 21 in. Long
$ 103.74
355-392

355-392

Legend 2 Branch Boiler Header, 1 in. X 3/4 in., 14 in. Long
$ 102.77
H-41415

H-41415

Webstone 1 1/4 ISOLATOR With Multi Function Drain & Rotating Flange
$ 101.83
H-50415

H-50415

Webstone 1 1/4 in. Sweat ISOLATOR Pump Flange With Drain
$ 101.83
H-40415

H-40415

Webstone 1 1/4 in. IPS ISOLATOR Pump Flange With Drain
$ 101.83
H-41414

H-41414

Webstone 1 IPS ISOLATOR With Multi Function Drain & Rotating Flange
$ 101.83
HGT-60

HGT-60

Calefactio 8 Gallon Heating System Expansion Tank
$ 100.50
009

009

Tekmar 24 V (ac) Transformer
$ 99.18
NA10366

NA10366

Caleffi LegioMix check valve assembly for 1 in. & 1-1/4 in.
$ 98.78
573503A

573503A

Caleffi Caleffi Backflow Preventer 3/4 in. NPT
$ 98.00
078

078

Tekmar Universal Sensor - 15' (4.6 m) wire
$ 97.56
HGTE-12

HGTE-12

Calefactio 4.7 Gallon Potable Water System Expansion Tank
$ 94.50
077

077

Tekmar Indoor Sensor - Cover Plate
$ 91.09
H-51406

H-51406

Webstone 1 1/2 in. Sweat ISOLATOR Rotating Pump Flange
$ 89.39
H-50406

H-50406

Webstone 1 1/2 in. Sweat ISOLATOR Pump Flange
$ 89.39
H-41406

H-41406

Webstone 1 1/2 in. IPS ISOLATOR With Rotating Flange
$ 89.39
H-40406

H-40406

Webstone 1 1/2 in. IPS ISOLATOR Pump Flange
$ 89.39
355-412

355-412

Legend 2 Branch Boiler Header, 1-1/4 in. X 1 in., 14 in. Long
$ 84.71
HGTE-8

HGTE-8

Calefactio 3.2 Gallon Potable Water System Expansion Tank
$ 84.00
H-50414

H-50414

Webstone 1 in. Sweat ISOLATOR Pump Flange With Drain
$ 81.44
H-40414

H-40414

Webstone 1 in. IPS ISOLATOR Pump Flange With Drain
$ 81.44
301P

301P

Tekmar One Zone Switching Relay
$ 81.39
NC-1W Axiom NC-1W "Wall Hung" Condensate Neutralizer

NC-1W

Axiom Condensate Neutralizer - "NeutraPal" Vertical Wall Mount (400kBTU/hr, 1.6USG/hr)
$ 81.20
083

083

Tekmar Duct Sensor - 6 in. Probe
$ 80.85
081

081

Tekmar Three Outdoor Sensor Module
$ 79.77
M3069

M3069

Tekmar Replacement 40 VA Transformer for 304P 306P 304V 306V
$ 79.77
HGSV34

HGSV34

Calefactio Potable Water Service Valve
$ 73.31
NA16160

NA16160

Caleffi HydroMixer 1 in. FPT Inlet Union Fitting
$ 71.97
H-51405

H-51405

Webstone 1 1/4 in. Sweat ISOLATOR Rotating Pump Flange
$ 71.50
H-50405

H-50405

Webstone 1 1/4 in. Sweat ISOLATOR Pump Flange
$ 71.50
H-41405

H-41405

Webstone 1 1/4 in. IPS ISOLATOR With Rotating Flange
$ 71.50
H-40405

H-40405

Webstone 1 1/4 in. IPS ISOLATOR Pump Flange
$ 71.50
NA16060

NA16060

Caleffi HydroMixer 1 in. MPT Outlet Union Fitting
$ 71.19
355-402

355-402

Legend 2 Branch Boiler Header, 1-1/4 in. X 3/4 in., 14 in. Long
$ 69.78
004

004

Tekmar Relay - 120 V (ac) coil
$ 69.53
NC-1S

NC-1S

Axiom Condensate Neutralizer - "NeutraPal" Hard Pipe Kit (400kBTU/hr, 1.6USG/hr)
$ 68.67
003

003

Tekmar Relay - 24 V (ac) coil
$ 68.45
519006

519006

Caleffi Adjustable differential pressure by-pass valve
$ 68.44
H-41413

H-41413

Webstone 3/4 IPS ISOLATOR With Multi Function Drain & Rotating Flange
$ 66.76
H-50413

H-50413

Webstone 3/4 in. Sweat ISOLATOR Pump Flange With Drain
$ 66.76
H-40413

H-40413

Webstone 3/4 in. IPS ISOLATOR Pump Flange With Drain
$ 66.76
705100

705100

Watts Combination Temp/Pressure Gauge, 60°–320°F/0–200
$ 65.36
705075

705075

Watts Combination Temp/Pressure Gauge, 32 deg–248 degF/0–50 PSI
$ 65.36
M3053

M3053

Tekmar Replacement Fuses (5/pkg) 2.5 A 250 V (ac)
$ 63.60
M3051

M3051

Tekmar Replacement Fuses (5/pkg) 1.25 A 250V (ac)
$ 63.60
165001

165001

Caleffi HydroMixer Wall Bracket
$ 61.23
M3052

M3052

Tekmar Replacement Fuses (5/pkg) 15 A 250 V (ac)
$ 60.91
080

080

Tekmar Universal Sensor Enclosure
$ 60.37
HGSC-SS

HGSC-SS

Calefactio Stainless Steel Service Center
$ 60.24
HGTE-5

HGTE-5

Calefactio 2.1 Gallon Potable Water System Expansion Tank
$ 60.00
529912

529912

Grundfos 3/4 in. Half-Union Threaded End for Domestic Recirculators, Pair
$ 58.10
HCE4-94

HCE4-94

Webstone 1 in. Hydro-Core Union x 1 in. Sweat Multi Device Port End
$ 57.90
076

076

Tekmar Indoor Sensor - G Enclosure
$ 57.67
H-51404

H-51404

Webstone 1 in. Sweat ISOLATOR Rotating Pump Flange
$ 57.22
H-50404

H-50404

Webstone 1 in. Sweat ISOLATOR Pump Flange
$ 57.22
H-41404

H-41404

Webstone 1 in. IPS ISOLATOR With Rotating Flange
$ 57.22
H-40404

H-40404

Webstone 1 in. IPS ISOLATOR Pump Flange
$ 57.22
HCE5-75

HCE5-75

Webstone 1 1/4 in. Union x 1 1/4 in. Sweat Hydro-Core End
$ 56.48
HCE5-74

HCE5-74

Webstone 1 1/4 in. Union x 1 in. Sweat Hydro-Core End
$ 56.48
HCE5-65

HCE5-65

Webstone 1 1/4 in. Union x 1 1/4 in. Female Pipe Hydro-Core End
$ 56.48
HGT-30

HGT-30

Calefactio 4.8 Gallon Heating System Expansion Tank
$ 55.50
084

084

Tekmar Indoor Sensor-Flush Mount
$ 54.44
HGSC

HGSC

Calefactio Service Center
$ 51.12
085

085

Tekmar Solar Sensor -5' (1.5 m) Wire
$ 50.13
H-51403

H-51403

Webstone 3/4 in. Sweat ISOLATOR Rotating Pump Flange
$ 47.68
H-50403

H-50403

Webstone 3/4 in. Sweat ISOLATOR Pump Flange
$ 47.68
H-41403

H-41403

Webstone 3/4 in. IPS ISOLATOR With Rotating Flange
$ 47.68
H-40403

H-40403

Webstone 3/4 in. IPS ISOLATOR Pump Flange
$ 47.68
070

070

Tekmar Outdoor Sensor
$ 46.89
H-44672

H-44672

Webstone Expansion Tank Service Valves
$ 46.44
H-41672

H-41672

Webstone Expansion Tank Valve
$ 46.44
082

082

Tekmar Universal Sensor -8 ft. (2.4 m) wire
$ 45.28
079 Tekmar 518 & 519 Installation Video

079

Tekmar Slab Sensor - 10' wire
$ 43.66
H-50402

H-50402

Webstone 1/2 in. Sweat ISOLATOR Pump Flange
$ 42.91
H-40402

H-40402

Webstone 1/2 in. IPS ISOLATOR Pump Flange
$ 42.91
HGT-15 CALEFACTIO - EXPANSION TANKS

HGT-15

Calefactio 2.1 Gallon Heating System Expansion Tank
$ 42.75
HCE6-56

HCE6-56

Webstone 1 1/2 in. Union x 1 1/2 in. Sweat Hydro-Core End
$ 41.60
071

071

Tekmar Universal Sensor - 10 in. (300 mm) wire
$ 39.35
HCE4-74

HCE4-74

Webstone 1 in. Union x 1 in. Sweat Hydro-Core End
$ 38.64
HCE4-64

HCE4-64

Webstone 1 in. Union x 1 in. Female Pipe Hydro-Core End
$ 38.64
HCE4-63

HCE4-63

Webstone 1 in. Union x 3/4 in. Female Pipe Hydro-Core End
$ 38.64
L800-668

L800-668

Legend 1 in. MPT Pressure Test Gauge, Straight
$ 37.14
HCE5-55

HCE5-55

Webstone 1-1/4 in. Union x 1-1/4 in. Sweat Hydro-Core End
$ 31.95
HCE5-54

HCE5-54

Webstone 1 1/4 in. Union x 1 in. Sweat Hydro-Core End
$ 31.95
HCE5-45

HCE5-45

Webstone 1-1/4 in. Union x 1-1/4 in. FPT Hydro-Core End
$ 31.95
HGSV12

HGSV12

Calefactio Service Valves ½ in. FNPT
$ 30.32
014

014

Tekmar Adaptor Plate 014 - for 561, 562, 563
$ 29.65
012

012

Tekmar Adaptor Plate 012 - for Enclosure S
$ 29.65
HCE5-44

HCE5-44

Webstone 1-1/4 in. Union x 1 in. FPT Hydro-Core End
$ 28.14
676000A

676000A

Caleffi Body only, close-off 20 psid
$ 26.97
HCE4-54

HCE4-54

Webstone 1 in. Union x 1 in. Sweat Hydro-Core End
$ 20.31
HCE4-53

HCE4-53

Webstone 1 in. Union x 3/4 in. Sweat Hydro-Core End
$ 20.31
HCE4-44

HCE4-44

Webstone 1 in. Union x 1 in. FPT Hydro-Core End
$ 20.31
HCE4-43

HCE4-43

Webstone 1 in. Union x 3/4 in. FPT Hydro-Core End
$ 20.31
L800-660

L800-660

Legend 3/4 in. Hose Thread Pressure Test Gauge
$ 17.86
800-653

800-653

Legend Temperature Gauge LF, 2 in. Dial, 60°–280°F, w/Well
$ 17.12
BRACKET270MM

BRACKET270MM

Calefactio Expansion Tank Mounting Bracket for HGT-30 & HGT-60M
$ 16.41
BRACKET200MM

BRACKET200MM

Calefactio Expansion Tank Mounting Bracket for HGT-15
$ 14.33
PX10285

PX10285

FHT Adaptor use with PX10286
$ 4.26