Best Water Heater Installations in Diamond Bar, CA (2026)

9 verified businesses · Sorted by rating & reviews

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Drain CleaningFaucet Repair & InstallationPlumberSewer Line RepairToilet RepairWater Heater Repair
1

A-1 Total Service Plumbing

Google★★★★½4.91.5k reviews
Yelp4.5 stars4.6437 reviews
↓ Declining·3 mo: 4.7★ (9)·6 mo: 4.9★ (23)
640 S Atlantic Blvd, Los Angeles, CA 90022
+1323-643-2844
Plumber
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A-1 Total Service Plumbing photo 1A-1 Total Service Plumbing photo 2A-1 Total Service Plumbing photo 3A-1 Total Service Plumbing photo 4A-1 Total Service Plumbing photo 5
2

Southwest Heating & Air Conditioning

Google★★★★½4.9339 reviews
Yelp4.5 stars4.5544 reviews
→ Stable·3 mo: 5★ (7)·6 mo: 5★ (30)
Staff:+Bobby (2)owner (2)
622 Alpine St, Los Angeles, CA 90012
+1310-867-0703
HVAC contractor
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Southwest Heating & Air Conditioning photo 1Southwest Heating & Air Conditioning photo 2Southwest Heating & Air Conditioning photo 3Southwest Heating & Air Conditioning photo 4Southwest Heating & Air Conditioning photo 5Southwest Heating & Air Conditioning photo 6
3

L.A to O.C Plumbing Pro

Google★★★★★5107 reviews
→ Stable·3 mo: 5★ (2)·6 mo: 5★ (5)
Staff:+Mando (2)
+1323-239-8505
Plumber
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4

Caden's Plumbers

Google★★★★½4.764 reviews
→ Stable·3 mo: 4.7★ (6)·6 mo: 4.9★ (19)
Staff:+Jonah (2)+Bradley (2)
417 Bauchet St #1863, Los Angeles, CA 90012
+1213-634-2296
Plumber
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5

Y & B Electric & Plumbing

Google★★★★★533 reviews
→ Stable·3 mo: 5★ (23)·6 mo: 5★ (35)
546 S Spring St, Los Angeles, CA 90013
+1213-335-6059
Electrician
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Y & B Electric & Plumbing photo 1
6

Precision Emergency Plumber Los Angeles

Google★★★★★516 reviews
→ Stable·3 mo: 5★ (7)·6 mo: 5★ (16)
412 Colyton St, Los Angeles, CA 90013
+1213-451-6567
Plumber
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7

HVAC Services Cerritos

Google★★★★★54 reviews
+1562-724-4175
Plumber
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8

AM-PM Plumbing Inc.

Google★★★★★55 reviews
+1323-851-2692
Plumber
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9

Quick Pipe Solutions ILC

Google★★★★★55 reviews
319 E 2nd St, Los Angeles, CA 90012
+1424-490-3020
Repair service
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