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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? View our tankless water heater index page.

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.

No.	Part #	Description	Price & Quantity
1	10-12212	Union Nut, Heat Exchanger	No Longer Available
2	10-12213	Comp. Flange, Brnz. Heat Exchanger	No Longer Available
3	20-10047	'O' Ring - Heat Exchanger	$4.11	Enter a quantity and
4	10-13843	Outlet Adaptor, ECO @ HX	No Longer Available
5	10-12731	ADP Assembly In/Out	No Longer Available
6	10-10062	Direct Vent Flu Seal	No Longer Available
7	10-10916	Heat Exchanger Seal	No Longer Available
8	10-14689	Heat Exchanger	No Longer Available
9	10-10075	Direct Vent Case Seal	$16.54	Enter a quantity and
10	10-19030	DV Cover - White	No Longer Available
11	10-13056	CF Cover - White	No Longer Available
12	10-19224 10-19226	CF Bottom Cover - Gray DV Bottom Cover - Gray	No Longer Available
13	10-19055	ECO Assembly With Leads From Serial No. 15 000 000 0	No Longer Available
14	10-13849	Thermocouple Connector	$29.25	Enter a quantity and
15	10-13846	Interrupter Insert	$14.30	Enter a quantity and
16	10-13848	Thermocouple	$38.84	Enter a quantity and
17	12-13055	Fix/nut Thermocouple	No Longer Available
18	22-13059	Pilot Mounting Assembly	No Longer Available
20	10-12259	Electrode Assembly	No Longer Available
21	10-12694	Pilot Filter	No Longer Available
22	10-13706	FSD Assembly	No Longer Available
23	10-12410	Magnet Main Gas Valve	$138.34	Enter a quantity and
24	10-11935	Piezo Igniter	$31.02	Enter a quantity and
25	10-13008 10-12989	Regulator Assembly - NG Regulator Assembly - LP Gas	No Longer Available
26	10-14639	Button - Stop	No Longer Available
27	10-13705	Button - Start	No Longer Available
28	10-14641	Button - Igniter	No Longer Available
29	10-13486	Thermostat Bellows and Bulb	No Longer Available
30	20-14834	'O' Ring - Thermostat Sensing Bulb	$4.14	Enter a quantity and
31	10-14536	Thermostat Assembly Complete (includes #29 & #32)	No Longer Available
32	10-11904	Thermostat Assembly Pin	$18.29	Enter a quantity and
33	10-14637	Cold Inlet Throttle	No Longer Available
34	10-14637	Cold Water Inlet Screen	No Longer Available
35	20-12335	'O' Ring - Sensing Tube (PAIR)	$6.24	Enter a quantity and
36	10-13495	Long Sensing Tube	No Longer Available
37	10-14923	Short Sensing Tube	No Longer Available
38	10-13561	Diaphragm Housing Assembly	No Longer Available
39	10-12460	Diaphragm EPDM W/Plate	$58.73	Enter a quantity and
40	20-15360	'O' Ring - Ball Disk	No Longer Available
41	10-12373	Pin, Automatic Valve Assembly	No Longer Available
42	20-11822	'O' Ring - Diaphragm Drive Pin	$10.45	Enter a quantity and
43	10-12458 10-12803	Automatic Valve Assembly - NG Automatic Valve Assembly - LP Gas	No Longer Available
44	10-12848	Manifold Gasket	No Longer Available
45	10-12345	Stainless Burner	No Longer Available
46	19-12780 19-12782	Standard Orifice/Inj, - NG Standard Orifice/Inj, - LP Gas	No Longer Available

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

Part #	Description	Price & Quantity
10-10075	Case seal for former direct vent	$16.54	Enter a quantity and
10-13846	Ceramic interrupter insert	$14.30	Enter a quantity and
10-12460	Diaphragm	$58.73	Enter a quantity and
10-13495	Long sensing tube	No Longer Available
10-12410	Magnet, main gas valve, ffd assy	$138.34	Enter a quantity and
20-11822	O-ring for diaphragm push pin	$10.45	Enter a quantity and

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Part #	Description	Price & Quantity
20-10047	O-ring for heat exchanger	$4.11	Enter a quantity and
20-12335	O-ring for sensing tube (PAIR)	$6.24	Enter a quantity and
20-14834	O-ring for thermostat bellows	$4.14	Enter a quantity and
10-11935	Piezo electric	$31.02	Enter a quantity and
10-10196	Seat tape for heat exchanger	$22.05	Enter a quantity and
10-14923	Short sensing tube	No Longer Available

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Part #	Description	Price & Quantity
10-11904	Thermostat assembly pin	$18.29	Enter a quantity and
10-13848	Thermocouple	$38.84	Enter a quantity and
10-13849	Thermocouple connector extension	$29.25	Enter a quantity and
10-13486	Thermostat bellows	No Longer Available

Note: If your Myson was manufactured in England then the above parts should fit.

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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!

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