Hot Water Pump Too Sensitive to Cold Water Pressure


There's something wrong with the plumbing, because the shower temperature simply will not stay constant. It gradually changes to either scalding hot, or freezing cold while it's running.

The temperature dial is over sensitive - the slightest touch sends the temperature to one of the extremes. A plumber mentioned to me that the water pressure of hot and cold water coming into the shower might be uneven, and the shower unit cannot balance it.

How do I balance the pressure myself? I had a look at the pipes under the boiler but couldn't see anything to change the pressure.

Our flat is in London, England in a house that's been converted into four flats. We have a combination boiler and a 'normal' shower (not a power shower).

P.S. I've noticed that if I turn on the central heating then the shower temperature stays constant. Also, the radiators heat up when the shower is turned on hot, even though the central heating is...

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Pump pressure control switch FAQs:

This article series answers commonly-asked questions about how to adjust a well pump or water pump pressure control switch.

We provide pump pressure setting advice, procedures & questions & answers about adjusting the pump switch.

Green links show where you are. © Copyright 2017, All Rights Reserved.

FAQs on how to set the water pump pressure switch cut-in and cut-out pressures

Watch out: SAFETY WARNING OF FATAL SHOCK HAZARD: if you remove the cover of the pump pressure control switch you can get access to the two nuts that adjust the operating pressures of the water pump.

But watch out! There are also live electrical contacts exposed in this area. If you touch them, especially being near water piping, there is a serious risk of death by...

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Pressure washers come in two fundamental designs...either hot water pressure washer or a cold water pressure washer. Once you determine if you want to use hot water or cold water, then more choices come into play, regarding fuel types and mobility. But for now, let’s look at the difference between hot water and cold water models. If you're not quite sure which type you need, consider the following:

Cold pressure washers are ideal for removing dirt. However, if the surface you are cleaning is mixed with oil or grease, a cold water pressure washer won’t clean as well as a hot water pressure washer.

Think of it like washing greasy dishes in the sink. No matter how much soap you use, you are only smearing the grease around in cold water. Add hot water, and it cuts through the grease and oil in no time. The same applies to cleaning with a pressure washer. If oil or grease is present in any form, you will need a hot water pressure washer to remove it...

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2. BurCam 506532SS Water Pressure Booster Pump

3. Zodiac PB4-60 Polaris Booster Pump

4. Grundfos MQ3-45 1 HP Pressure Booster Pump

5. Grundfos MQ3-35 96860172 3/4 HP Pressure Booster Pump

How to Choose The Best Water Pressure Booster Pumps


When looking at a pump, you have to make sure that it will work within your home. While the power of the machine will play a major role, if you have limited room in which to install the pump then you will be restricted in your decision. Not only do you have to pay attention to the size of the unit itself but you’ll have to look at the piping that will connect to your water tank. While you can get adapters if the pipe is too small or big, it can affect the overall pressure and cause the pump to work harder to get the same results. As such, it’s always best to get a size that...

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Here you’ll be introduced to the 2 best hot water pressure washers for most people. One is a light-duty electric. The other is heavy-duty with a gasoline powered engine / pump and diesel burner.

Unless you’re a pro that gets paid to power wash don’t buy a hot water power washer.

Why? They’re just too expensive for residential-use. The most affordable one is $1,799 (on-sale). And that’s the 1,200 PSI machine down below.

But if money is no matter and you’re dead-set on a hot water unit then let’s take a look why hot water cleans more, better and quicker.

How Hot Water Pressure Washers Clean Better, Faster

Here’s the deal:

Answering why hot water cleans better than cold water is right up my alley… It’s a simple study in thermodynamics (heat and energy, including internal energy of a system) and kinetics (forces and motion) – both branches of physics. I studied mechanical engineering, which included a few thermo and kinetics courses…...

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Primarily this is caused by some other user of hot water. Like the cloths washer or dishwasher turning on. They drain the hot water available and so your shower goes cold.
Flexible PVC pipe
Hot water boilers contain a reduced orifice insert (presumably to maintain pressure in the boiler. These can become clogged with deposits that build up over the years. Any recent repairs of your water supply, can aggravate the situation providing contaminated water to add to the deposits. You probably need to clean or replace this orifice. If the previous answers have not helped solve the problem, try this: What is the source of energy that lifts and drives the hot water from the tank to your fixtures? It's the cold water, under pressure, pushing INTO the tank, that pushes the hot water OUT. If EVERY cold water outlet runs at full pressure, then start at the cold water feed at the heater. The union at the top of the heater will tell you if the water is getting there. The...

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Over pressurization can damage your plumbing. Use a pressure reducing valve to dial-in your final water pressure once the Pressure Booster is installed.

Our high pressure water pumps are specifically designed to start as soon as you switch on the tap and stays running until water is no longer required. Our High Pressure Booster Systems employ the latest technology for maximum pump protection. Exclusive electronic control continuously monitors water flow and automatically switches pump off if water supply becomes inadequate or the temperature gets too high. The Torrium control also measures the system pressure and adapts the system cut-in pressure according to circumstances, providing a more reliable system.

Pipe Connections
230v: Inlet/Suction - 1``NPT Outlet/Discharge - 1``NPT
Running Amps
230v: 5 amps
Use 15 amp breaker if on dedicated circuit or 20 amp breaker if sharing a circuit.

We highly recommend one of our available...

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This is how a pipe would look after considerable usage.

Just imagine that you are driving on 15 lane highway, and all lanes are in use. Traffic is free flowing and not stopped anywhere. All the cars would be wizzing past.

Suddenly you put up a sign of lane closed at far ends of lanes, one on the slowest one and one on the fastest one. Now there would be a traffic buildup. Slowly and gradually there would be a pile up.

Now to makes things more interesting, you close two more lanes. Now just imagine the plight of traffic flow.

This is exactly what happens inside your bathroom plumbing.

The pipe size inside bathroom/ kitchen is never more than 20mm (3/4 Of inch).

Smaller the pipe size, accelerated the scaling formation.

For eg: 15 mm pipe would have cross section area of


= 3.14*(7.5)^2

= 177 mm2 (rounded off)

If this gets reduced to 14 mm then


= 154mm2 (rounded...

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I’m a bit of an eco-geek, and trying to green up my lifestyle. I figured solar hot water was one of the best places to start, and this is the story of the journey so far. I now have a running system that generally works very well and I am happy with. I wasn’t an easy road however and hopefully others can learn from my mistakes.

There are several rebates available from both the Federal and some State governments (not Queensland). You can also sell the REC’s from certified systems. The Federal Gov rebate is currently for $1000.
A DIY system will get none of the above.

My house was fitted with an old instantaneous gas hot water system that had poor flow, awful temperature regulation and chewed too much gas, especially with the pilot light. I initially started considering all the cheapskate systems I could think of, whilst trying to achieve my ideal of solar booted with instantaneous gas when required. I like having lots of hot water and harvest my water...

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The least expensive way to heat domestic hot water is with natural gas. Homes without access to natural gas usually choose an electric water heater, since electricity is generally cheaper than propane.

Although most electric water heaters use electric resistance elements to heat water, a more efficient method uses a heat pumpHeating and cooling system in which specialized refrigerant fluid in a sealed system is alternately evaporated and condensed, changing its state from liquid to vapor by altering its pressure; this phase change allows heat to be transferred into or out of the house. See air-source heat pump and ground-source heat pump. — in other words, a device that heats the water using a compressor like the one found in a refrigerator or air conditioner. While a refrigerator transfers heat from the interior of the refrigerator to the room where the refrigerator is located — in effect, heating the room — a heat-pump water heater transfers heat from the room to a tank of...

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Thermal Storage Tanks, ...
Some of the options available for storing heat or "coolth". Homemade EPDM lined plywood tanks

Full Details...

Similar Storage tank for $1K system...


Ray's similar tanks ... (including a concrete one)

Plywood tanks lined with an EPDM membrane are good to about 180F, and are reported to last 10 to 20 years or even longer before liner replacement is needed.

The tank frame can be made from lumber and plywood, but the loads are high for even not so large tanks, so be careful.
This is the tank I use in my "Solar Shed" house heating system Full details on design and construction.

Alan Rushforth on Building Large Heat Storage Tanks...

Detailed information from Alan Rushforth on building large solar heat storage tanks.

The tanks consist of a sheet metal outer wall with a layers of insulation and an EPDM waterproof liner inside. They can be quite large -- up to 5000...

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Engine Tune and Performance:Engine Tune and Performance; Symptoms: FAQ Home
Volvo Maintenance FAQ for 7xx/9xx/90 Cars Version 5.0


General Symptoms and B230 Engines:

Poor Performance, Idle Surge and Hunt: Dirty Throttle Body

Poor Idle; TB Cleaned; Now Idle is Too High

Fuel Intake Carbon Removal

Notes on Cleaning Up Fuel System Deposits

Engine Dies After Starting, Won't Idle; Needs Intake Cleaning

Poor Idle: Injectors Need Cleaning

Idle Speed Control on Late 7xx/9xx

No Start; Frequent Stall or Hesitation: Basic Diagnostics

Intermittent No Start or No Warm Restart: Radio Suppression, FI Relay, RPM Sensor

No Start; Tear in Air Duct Intake Hose

Runs Rich; Black Smoke; Poor Acceleration: ECT, TPS, FI.

760T Floods and Stalls: ECT?

Cold Start, Dies; Dirty or Faulty IAC


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