Skip to main content
Largest Inventory - Best Service - Lowest Prices
A | B | C | D | E | F | G | H | I | J | K | L | M N | O | P | Q | R | S | T | U | V | W | X | Y | Z
Same day shipping on in-stock orders placed before 4:30pm Pacific Time M-F

Myson Thermar Tankless Parts

PlumbingSupply.com® is your source for hard-to-find Myson tankless water heater repair parts. Shopping for a replacement tankless water heater? Click here for our tankless water heater index page.

need parts for a Aquastar gas tankless water heater?

Please note: ONLY the Myson parts that have prices shown are available.
Some of the parts shown in this parts breakdown are no longer available.

Gas Myson Tankless

No. Part # Description Price & Quantity
1 10-12212 Union Nut, Heat Exchanger --
2 10-12213 Comp. Flange, Brnz. Heat Exchanger --
3 20-10047 'O' Ring - Heat Exchanger $3.47
4 10-13843 Outlet Adaptor, ECO @ HX --
5 10-12731 ADP Assembly In/Out --
6 10-10062 Direct Vent Flu Seal --
7 10-10916 Heat Exchanger Seal --
8 10-14689 Heat Exchanger --
9 10-10075 Direct Vent Case Seal $22.50
10 10-19030 DV Cover - White --
11 10-13056 CF Cover - White --
12 10-19224
10-19226
CF Bottom Cover - Gray
DV Bottom Cover - Gray
--
13 10-19055 ECO Assembly With Leads From Serial No. 15 000 000 0 --
14 10-13849 Thermocouple Connector $36.09
15 10-13846 Interrupter Insert $18.09
16 10-13848 Thermocouple $31.50
17 12-13055 Fix/nut Thermocouple --
18 22-13059 Pilot Mounting Assembly --
20 10-12259 Electrode Assembly --
21 10-12694 Pilot Filter --
22 10-13706 FSD Assembly --
23 10-12410 Magnet. Main Gas Valve $118.50
24 10-11935 Piezo Igniter $42.00
25 10-13008
10-12989
Regulator Assembly - NG
Regulator Assembly - LP Gas
--
26 10-14639 Button - Stop --
27 10-13705 Button - Start --
28 10-14641 Button - Igniter --
29 10-13486 Thermostat Bellows and Bulb --
30 20-14834 'O' Ring - Thermostat Sensing Bulb $3.50
31 10-14536 Thermostat Assembly Complete (includes #29 & #32) --
32 10-11904 Pin, Stat Assembly $15.19
33 10-14637 Cold Inlet Throttle --
34 10-14637 Cold Water Inlet Screen --
35 20-12335 'O' Ring - Sensing Tube (PAIR) $4.99
36 10-13495 Long Sensing Tube $42.15
37 10-14923 Short Sensing Tube $37.50
38 10-13561 Diaphragm Housing Assembly --
39 10-12460 Diaphragm EPDM W/Plate $49.32
40 20-15360 'O' Ring - Ball Disk --
41 10-12373 Pin, Automatic Valve Assembly --
42 20-11822 'O' Ring - Diaphragm Drive Pin $6.40
43 10-12458
10-12803
Automatic Valve Assembly - NG
Automatic Valve Assembly - LP Gas
--
44 10-12848 Manifold Gasket --
45 10-12345 Stainless Burner --
46 19-12780
19-12782
Standard Orifice/Inj, - NG
Standard Orifice/Inj, - LP Gas
--

- OR -

Parts For Some Thermar - Myson - Homemaster Gas Tankless Water Heaters

Part # Description Price & Quantity
10-10075 Case seal for former direct vent $22.50
10-13846 Ceramic interrupter insert $18.09
10-12460 Diaphragm $49.32
10-13850 Eco assembly see replacement #50-10014
50-10014 High-limit thermostat 13 1/2" lead $49.42
10-13495 Long sensing tube $42.15
10-12410 Magnet, main gas valve, ffd assy $118.50
20-11822 O-ring for diaphragm push pin $6.40
20-10047 O-ring for heat exchanger $3.47
20-12335 O-ring for sensing tube (PAIR) $4.99
20-14834 O-ring for thermostat bellows $3.50
10-11935 Piezo electric $42.00
10-10196 Seat tape for heat exchanger $29.99
10-14923 Short sensing tube $37.50
10-11904 Stat assembly pin $15.19
10-13848 Thermocouple $31.50
10-13849 Thermocouple connector extension $36.09
10-13486 Thermostat bellows --
If your Myson was manufactured in England then the above parts should fit.

- OR -

Frequently Asked Questions

Q. "Do you also sell old Thermar or Homemaster brand gas tankless parts?"
A. If your HomeMaster or Thermar gas tankless water heater was manufactured in England (Thermar #TL100 and #TL200), then our above Myson parts will probably fit (but we can't guarantee that they will in fact fit).

Customer Testimonials

"Since I was buying for an obsolete tankless water heater and haven't had hot water for 5 days, that you had the part was the most important factor."
- Ray Calvillo, Ceres, California 95307-2418

"Thanks for having exactly what we needed in stock. I liked your explanation of shipping charges/FAQ."
- Jesus Correa, Sycamore, Illinois 60178-2547

"Thanks for your excellent service. I will certainly use you again if the need arises and recommend you to anyone I know who needs your services."
- Edward Davis, Chapel Hill, North Carolina 27517-8570

Please note that every customer testimonial shown on our pages has given us written permission to quote them. Our customer's privacy is very important to us so we will never give, share or sell contact information or e-mail addresses to anyone!


return to top ↑